Motul Engine Oil Stop Leak 300ml Engine Oil Leak Sealer Additive
Motul Engine Oil Stop Leak 300ml Engine Oil Leak Sealer Additive

Motul Engine Oil Stop Leak 300ml – Engine Oil Leak Sealer Additive

£19.99
1
Brand
MOTUL
SKU
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Description

Motul Engine Oil Stop Leak is an engine oil additive that seals small oil leaks and seepage from gaskets and seals. It keeps gaskets supple and reduces oil passing the seals, helping to improve reliability and reduce wear without dismantling the engine.

It is compatible with all mineral and synthetic engine oils and works while you drive, making it a quick, cost-effective treatment for minor oil weeps and drips.

Supplied in Motul's German-market (DE) label.

Key Features

  • Seals small oil leaks and seepage
  • Keeps gaskets and seals flexible
  • Reduces oil passing the seals
  • Improves engine reliability and reduces wear
  • Compatible with all mineral and synthetic engine oils
  • Works while driving – no dismantling required

Compatibility

  • 4-stroke petrol and diesel engines
  • Turbocharged and naturally aspirated engines, with or without a catalytic converter
  • Cars, commercial vehicles and other closed-loop oil circuits

How to Use

  1. Check the engine oil level first.
  2. Add 300ml to the engine oil for oil capacities up to 5 litres; add a further 50ml per additional litre.
  3. Drive normally – the product works while the engine is running. Use whenever needed.

Product Specifications

Manufacturer: Motul
Motul Part Number: 110647
Volume: 300ml
Treat Rate: 300ml per 5L of engine oil (+50ml per extra litre)
Engine Type: 4-stroke petrol & diesel
Oil Compatibility: All mineral and synthetic oils

Frequently Asked Questions

What does Motul Engine Oil Stop Leak do?
It seals small oil leaks and seepage, keeps gaskets flexible and reduces oil passing the seals.

How much should I add?
300ml treats up to 5 litres of engine oil. Add 50ml for each additional litre.

Will it fix a large oil leak?
No. It is designed for small leaks and seepage. Larger leaks or failed components should be repaired mechanically.

Why Buy From R44 Performance?

R44 Performance is a UK-based specialist in BMW and performance car parts, servicing products and fluids. We stock the Motul range alongside Genuine BMW service parts, so you can put together everything you need for a complete service in one order.

  • Genuine Motul product
  • Specialist advice from our performance team
  • Fast UK and worldwide shipping
  • Dedicated support before and after purchase

Always follow the instructions on the product label and check your vehicle manufacturer's recommendations before use.

  • All in-stock products ship the same day if ordered before 15:00 UK time.
  • Orders containing both in-stock and backorder items are dispatched together, once every product is available.
  • For out-of-stock items we will contact you with an estimated wait time if not otherwise specified on this page.
  • Shipping estimates are based on courier delivery times and do not include the time to despatch from our warehouse.
  • We ship worldwide. Orders outside the UK may be subject to additional duties or fees.

If upon receiving your product you wish to return it, we offer a 30-day returns policy. For our in-depth returns information, see the R44 returns policy.

We get a large number of custom orders and requests every day, so it is not always possible for us to keep every item in stock at all times in our warehouse.

If you require an item urgently, please contact our sales team to check stock before you make your purchase.

We understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us with your query.

Our sales team will then be in touch to confirm whether this is the correct part for your vehicle.

We also offer fitting at our London workshop. Contact our sales team to arrange it alongside your order.

Warranty

All of our products come with a standard warranty of 1–3 years, depending on the type of product. For full details please see our warranty page.

Disclaimer

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated race only and are solely for competition or off-road use limited to racing formally sanctioned by a recognised racing organisation. Any other use, including recreational off-road use, may violate local, state and federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check all federal, state, local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check these before ordering and installing a product.

Off-Road & EPA Disclaimer

Last updated: September 2026

Why This Page Exists

R44 Performance sells parts that make cars faster, louder, sharper and better to drive. A good number of those parts change something a vehicle was originally certified with — the exhaust after the turbo, the catalytic converter, the particulate filter, the engine map, the intake, the suspension geometry, the lighting. That is the entire point of them. It is also the reason this page exists.

Whether a given part can lawfully be used on a public road depends almost entirely on where that road is. A downpipe that is a completely ordinary track-day part in one country is a criminal offence to fit to a road car in another. The same box, the same part number, two totally different legal answers. We ship worldwide, so we cannot write one rule that covers everybody — but we can be straight with you about it rather than burying a line of small print at the bottom of a checkout page.

So here is our position, in plain English:

  • Assume a performance part is off-road, track or competition use unless we have specifically told you otherwise. If a listing says "road legal", "E-marked", "ECE approved", "type approved" or quotes a CARB EO number, we mean it. If it says nothing, do not assume.
  • Ask us before you order, not after. Our team knows this catalogue extremely well and will happily tell you what a part does to a vehicle's emissions, noise and approval status. We would far rather spend ten minutes on an email than have you fail an inspection.
  • We will tell you when the honest answer is "don't". If a part is a bad idea for how you have described using the car, we will say so, and we will point you at something that is not.
  • We reserve the right to refuse or cancel an order where we believe a part is intended for unlawful use on a public road.

What we cannot do is tell you what is legal on your specific vehicle, in your specific town, under your specific inspection regime, or guarantee how an individual inspector or insurer will treat a modification. Those rules differ by country, by state or province, sometimes by city, and they change. That responsibility sits with you as the owner of the vehicle — and the summaries below are there to give you a running start on it.

Quick Guide By Market

Pick your market for a plain-English summary. These summaries are a starting point and a prompt to go and check properly — the full legal terms are further down this page, and they are what governs your purchase.

United Kingdom

In short: track and off-road use is not the problem. Fitting emissions or noise-affecting parts to a road-registered, MOT'd car is where UK owners get caught out.

  • The MOT test includes emissions checks and a visual inspection for emissions equipment. A car presented with a missing or defeated catalytic converter, DPF or GPF will fail, and the tester is required to record it.
  • Removing or defeating emissions control equipment on a road-going vehicle is an offence under the Road Vehicles (Construction and Use) Regulations 1986, quite separately from the MOT.
  • Replacement exhausts must not make the vehicle noisier than it was when it was type approved, and silencers on most modern cars are expected to carry the appropriate marking. Roadside enforcement and local-authority noise cameras do act on this.
  • Almost every modification — exhaust, remap, intake, suspension, wheels, aero — must be declared to your insurer. An undeclared modification can invalidate cover entirely, which is usually a far more expensive problem than the MOT.
  • Vehicles used only on private land, on track or in competition are outside the road traffic regime and can be built as you like.

What this means when you order from us: de-cat and decat downpipes, sports cats without approval, GPF/DPF delete pipes and the maps that go with them are supplied for off-road, track and competition use only. Non-emissions parts — most suspension, brakes, styling, cooling and interior products — are generally unaffected, but check anything that alters lighting or ride height.

Ireland & the EU / EEA

In short: broadly similar to the UK in principle, but several member states are considerably stricter in practice, and Germany is the strictest of all.

  • Periodic roadworthiness testing applies across the EU/EEA under national schemes — the NCT in Ireland, the Hauptuntersuchung (TÜV, DEKRA and others) in Germany, the contrôle technique in France, the APK in the Netherlands, and equivalents elsewhere. Emissions equipment is checked.
  • Tampering with emissions control equipment on a road vehicle is prohibited EU-wide, and several states treat it as a serious offence rather than a technicality.
  • Germany in particular: parts generally need their own approval — an ABE, an EC/ECE type approval, or a Teilegutachten followed by an inspection and entry into the vehicle's papers. Fitting an unapproved part can invalidate the vehicle's operating permit (Betriebserlaubnis) and, with it, your insurance. Do not assume a UK-market part is acceptable.
  • Since Brexit, orders shipped from the UK into the EU are imports. Duties, import VAT and customs clearance apply, and some carriers will hold emissions-related parts.
  • Track and motorsport use is, as in the UK, a separate matter and generally unrestricted.

What this means when you order from us: if you are in Germany, Austria or Switzerland, please talk to us before ordering exhaust, suspension or lighting parts so we can tell you what approval documentation, if any, exists for that product. For most other member states the UK guidance above is a reasonable guide, but your national test is the authority.

United States

In short: the strictest enforcement environment we ship into, and the one where you most need to know your own state's rules before you click buy.

  • Federal law — the Clean Air Act — prohibits removing or rendering inoperative any emissions control device on a road vehicle, and prohibits selling parts whose principal effect is to defeat one. The EPA has actively enforced this against tuners, installers and retailers in recent years.
  • California, and the states that have adopted California standards, additionally require aftermarket parts affecting emissions to hold a CARB Executive Order (EO) number to be legal for street use. No EO means off-road only, whatever the part does.
  • Inspection regimes vary enormously by state — some run OBD-II and visual checks annually, some by county, some not at all. A part that passes unnoticed in one state will fail in the next one over.
  • Race, competition and dedicated off-road vehicles are treated differently from street-registered vehicles, and that distinction is the one that matters.

What this means when you order from us: we do not represent any product as EPA-compliant or CARB-compliant unless the listing explicitly says so and quotes the EO number. Everything else is supplied for off-road, race and competition use only, and by ordering you are confirming that is how it will be used. Please check the EPA's guidance on aftermarket parts and tampering, and CARB's aftermarket parts database, before you order.

Canada

In short: federal emissions rules plus a patchwork of provincial equipment, noise and inspection rules.

  • Federal on-road vehicle emissions regulations under the Canadian Environmental Protection Act govern emissions control equipment on road vehicles.
  • Provinces set their own rules on inspections, equipment standards, exhaust noise and out-of-province vehicle admission — Ontario, British Columbia and Quebec each work differently.
  • Municipal noise by-laws are actively enforced in several major cities and are a common cause of tickets for loud exhausts.
  • Import duties, taxes and brokerage apply to orders shipped from the UK.

What this means when you order from us: treat emissions and exhaust parts as off-road and track use unless your province tells you otherwise. Check your provincial transport authority's equipment standards before fitting anything to a road car.

Australia & New Zealand

In short: modification rules are formalised and genuinely enforced, and both countries have a certification route for road-legal modifications.

  • Australia: vehicles must continue to meet the Australian Design Rules. National guidance on modifications sits in the Vehicle Standards Bulletin (VSB14), with each state and territory operating its own approval, engineering certification and defect-notice system. Emissions-related modifications are among the most tightly controlled categories.
  • State enforcement — defect notices, "canary" and "yellow sticker" stickers, and EPA-issued noise and emissions notices — is common in NSW, Victoria and Queensland in particular.
  • New Zealand: the Warrant of Fitness applies, and many modifications require Low Volume Vehicle (LVV) certification to remain road legal.
  • Motorsport, club-level competition and off-road vehicles operate under separate rules.

What this means when you order from us: if you intend a part for road use, please check with a certifier or your state authority first — the certification route exists and works, but it needs to be planned before you buy, not afterwards. Otherwise, parts are supplied for track and competition use.

Rest of the world

In short: we ship almost everywhere, and almost everywhere has its own inspection and approval regime.

  • Japan operates the shaken inspection, with noise and emissions standards that replacement exhausts must be certified against.
  • The Gulf states, Singapore, South Africa and most of Asia run periodic inspection or registration checks covering exhaust, emissions, lighting and glazing.
  • Many countries restrict the import of emissions-defeating parts at the border, and customs may hold or seize them regardless of what we have written on the paperwork. We will not mis-declare goods to get around this.
  • Import duties, taxes and clearance charges are the customer's responsibility in all territories.

What this means when you order from us: please check your national vehicle inspection authority's rules before ordering, and ask us if you are unsure what a part actually changes. See our International Shipping Terms & Conditions for the shipping side of things.

Still not sure? Send us a message with your vehicle, where it is registered and how you use it, and we will give you a straight answer before you spend anything.

The Full Disclaimer

Many of the products sold on r44performance.com are designed and intended exclusively for off-road, track, competition and race use. By purchasing any performance or aftermarket part from R44 Performance, you agree and acknowledge that such products will only be used for off-road, track or competition purposes, and will not be fitted to a road-registered vehicle in any manner that breaches the laws of the country in which that vehicle is used.

1. Off-Road, Track & Competition Use Only

Products that fall under this disclaimer include, but are not limited to:

  • Exhaust systems and exhaust components — downpipes, midpipes, cat-back and turbo-back systems, headers/manifolds, valved and non-valved systems
  • Catalytic converter replacements, sports cats, de-cat pipes and decat downpipes
  • GPF/OPF and DPF delete or replacement pipes
  • Cold air intakes, induction kits and intake systems
  • ECU remaps, tuning software, piggyback modules and performance tunes
  • Turbocharger, supercharger and forced-induction upgrades
  • EGR delete kits, secondary-air and other emissions-related components
  • Suspension, brake, lighting, aerodynamic and bodywork parts that may not hold road type approval in your territory
  • Any other performance part that may alter a vehicle's factory emissions, exhaust, noise or safety configuration

Important: a product does not need to be explicitly labelled "off-road use only", "for race use only", "not road legal", "track use only" or "non-EPA compliant" in its description for this disclaimer to apply. This disclaimer applies to all products sold on r44performance.com that fall within the categories above, whether or not the individual product listing carries a specific compliance notice. Some listings do carry such notices; the absence of one does not imply that a product is road legal, type approved or emissions compliant in your territory.

2. UK & EU Road Legality

R44 Performance is based in the United Kingdom. Many aftermarket performance parts we supply may not comply with the Road Vehicles (Construction and Use) Regulations 1986, UK or EC/UNECE type approval requirements, MOT testing requirements, or national and local noise and emissions standards in the UK, the European Union or any other territory.

Under UK law it is, in general, an offence to use a vehicle on a public road if a component required for emissions control has been removed, disabled or rendered less effective, or if the vehicle no longer meets the noise or construction standards it was type approved to. Vehicles presented for an MOT with a missing or tampered catalytic converter, DPF or GPF will fail the test.

It is your sole responsibility to:

  • Understand the road traffic, type approval, noise and emissions laws that apply where the vehicle is registered and used, before placing an order
  • Determine whether a product may lawfully be fitted to your vehicle for the use you intend
  • Check whether a part carries the E-mark, type approval or homologation required in your territory, where such approval is required
  • Declare all modifications to your motor insurer, and satisfy yourself that your cover remains valid
  • Understand that fitting a non-compliant part to a road-going vehicle may result in an MOT failure, a roadworthiness prohibition, fines, penalty points, prosecution or vehicle seizure

Unless a listing expressly states otherwise (for example "road legal", "E-marked", "ECE approved" or "type approved"), R44 Performance makes no representation that a product is road legal, type approved or emissions compliant in the UK, the EU, or any other territory.

3. United States — EPA, Clean Air Act & CARB

Many aftermarket performance parts sold on this website do not comply with United States Environmental Protection Agency (EPA) regulations, the Clean Air Act, or state-level emissions standards, including but not limited to California Air Resources Board (CARB) requirements.

If you are ordering from, or shipping to, the United States, it is your sole responsibility to:

  • Research and understand all applicable federal, state and local emissions laws in your jurisdiction before placing an order
  • Determine whether a product is legal for your intended use in your state before purchasing
  • Verify whether a product is CARB-exempt or CARB-compliant where your state requires it — California residents especially
  • Understand that installing non-compliant parts on a street-driven vehicle may result in failed emissions inspections, fines, citations, vehicle impoundment or other legal consequences

R44 Performance does not guarantee that any product complies with emissions law in your state or jurisdiction unless the product listing expressly states otherwise (for example "CARB EO number issued" or "50-state legal"). Parts sold by R44 Performance are not offered or represented as EPA-compliant emissions-related replacement parts for road use in the United States.

4. Shipping & Export Restrictions

R44 Performance does not knowingly ship emissions-defeating or off-road-only parts to countries, states or jurisdictions in which such products are unlawful, unless the customer confirms that the product is being purchased exclusively for race car, track or off-road vehicle use.

By completing a purchase, you represent and warrant that any off-road or non-compliant product will be used solely for lawful off-road, track or competition purposes. We reserve the right to refuse, cancel or refund any order at our discretion where we believe a product is intended for unlawful use, and to require written confirmation of intended use before an order is dispatched. We will not mis-describe or under-declare goods on customs paperwork under any circumstances.

You are also responsible for any import duties, taxes, customs clearance requirements and import restrictions that apply in the destination country. Please also read our International Shipping Terms & Conditions and our Shipping Policy.

5. Vehicle Warranty Disclaimer

Fitting aftermarket performance parts may affect or void all or part of your vehicle's manufacturer warranty, extended warranty or approved-used warranty.

In the UK and EU, block exemption rules mean a manufacturer cannot automatically void an entire warranty simply because an aftermarket part has been fitted; however, a manufacturer or dealer may refuse a claim where it believes the part contributed to the failure. In the United States, the Magnuson-Moss Warranty Act provides comparable protections, but individual dealers and manufacturers interpret warranty coverage differently.

R44 Performance is not responsible or liable for any warranty claim refused or reduced by a vehicle manufacturer, dealer or warranty provider as a result of parts purchased from us being fitted. This includes, without limitation, engine, powertrain, drivetrain, emissions system and any related warranty coverage. Our own product warranty position is set out in our Warranty Policy.

6. Professional Installation

All performance and aftermarket parts should be fitted by a qualified professional technician or a competent specialist workshop, using the correct tools, torque figures and procedures. Improper installation can cause vehicle damage, component failure, fire risk, safety hazards or a voided warranty.

Fitting guides, torque figures and instructional content published by R44 Performance are provided for general guidance only and do not replace manufacturer instructions or professional judgement. R44 Performance is not liable for any damage, injury, loss or issue resulting from incorrect, incomplete or unsuitable installation, or from installation carried out by the customer or by a third party.

7. Assumption of Risk & Waiver of Liability

By purchasing performance or aftermarket parts from R44 Performance, you acknowledge, agree and represent that:

  • The product may be intended for off-road, track, race or competition use only
  • You will use off-road products only for lawful off-road, track or competition purposes, and will not use them on public roads in breach of applicable law
  • You are solely responsible for determining the legality of purchasing, fitting and using the product in your jurisdiction
  • You assume all risk associated with the purchase, installation and use of aftermarket parts, including use on track, at competitive events and in motorsport
  • To the fullest extent permitted by law, R44 Performance shall not be liable for any fine, penalty, citation, failed test or inspection, roadworthiness prohibition, vehicle seizure, prosecution, legal cost, vehicle damage, engine or component failure, personal injury, or any other loss or damage arising from the purchase, installation or use of products bought from this website
  • To the fullest extent permitted by law, you waive any claim, demand or cause of action against R44 Performance, its directors, employees and agents relating to emissions compliance, type approval, road legality, off-road use, or any legal consequence arising from the use of products purchased on r44performance.com
  • You have read and agree to this disclaimer as part of our Terms of Business

Your statutory rights. Nothing in this disclaimer excludes or limits our liability for death or personal injury caused by our negligence, for fraud or fraudulent misrepresentation, or for any other liability that cannot lawfully be excluded. Nothing here affects the statutory rights of consumers under the Consumer Rights Act 2015 or equivalent legislation in your country in respect of goods that are faulty, not as described or not of satisfactory quality.

8. No Returns or Cancellations for Compliance Reasons

R44 Performance does not accept returns, exchanges or cancellations on the basis that a customer has discovered after ordering that a product is not road legal in their country or state, will not pass an MOT or emissions inspection, is not type approved, is not CARB-compliant, or otherwise does not meet a local regulatory requirement — unless the product listing expressly stated that it was compliant and it is not.

It is your responsibility to verify all compliance requirements before purchasing, and we would much rather you asked us first. Please review our Returns & Refunds Policy for full details of when a return or cancellation can be accepted, including your statutory cancellation rights where these apply.

9. Product Descriptions & Listings

While we work hard to provide accurate product descriptions, fitment data and specifications, R44 Performance does not guarantee that every listing carries complete emissions or compliance information. Manufacturers also change specifications, approvals and part content without notice.

The absence of an off-road or compliance notice in a product description does not imply that a product is road legal, type approved or emissions compliant. If you are unsure whether a product may lawfully be used in your area, please contact us before ordering and we will do our best to help.

10. Agreement

By completing a purchase on r44performance.com, you confirm that you have read, understood and agree to this Off-Road & EPA Disclaimer in its entirety. This disclaimer is incorporated into and forms part of our Terms of Business. Continued use of this website and the completion of any order constitutes acceptance of these terms.

This page is provided for general information and does not constitute legal advice. Regulations differ by country, state and region and change over time. If you are in any doubt about the legality of a modification, seek advice from your local licensing or enforcement authority, or from a qualified professional, before purchasing.

Questions about product compliance?

Email us at info@r44performance.co.uk or get in touch via our Contact page. Tell us the vehicle, where it is registered and how you use it, and a member of the team will give you a straight answer before you order.

R44 Performance, 52 Aylmer Road, London, N2 0PL, United Kingdom

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