10 Best Engine Stop Smoke Additive of 2025

Tested and Reviewed: Top 10 Engine Stop Smoke Additive deals with expert ratings from 8.1 to a perfect 10

May 2026 Edition

Editor's Choice

9.7

Bardahl

Bardahl 2117 NoSmoke + StopLeak Motor Oil Additive - Treatment for Oil Burning & Excessive Exhaust Smoke - Engine Oil Leak Sealer - Stop Smoke & Quiet Noisy Engines While Restoring Engines - 16 fl oz

Editor's bottom line:

“This engine stop smoke additive is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

NO MORE BURNING OIL: Stop your engine from oil burning with the enhanced NoSmoke + StopLeak motor oil additive! Bardahl NoSmoke oil additive gives you top-quality protection and restoration for old engines by "filling in" loose tolerances with an extra-thick formula that reduces oil burning and excessive exhaust smoke. This engine additive stop oil burning solution ensures your vehicle runs cleaner and smoother.
LEAK SEALER: NoSmoke + StopLeak doesn't just reduce burn; it helps seal empty spaces that develop in engines over the years, acting as an engine oil leak sealer to reduce engine noise and quiet noisy lifters. It even helps restore the reliability of dry, brittle seals to stem further oil leaks. Your car won't just run better; it'll sound better too. Stop the smoke and the noise with this effective stop leak oil additive!
CONTROL EMISSIONS: As engines loosen, smoke and pollutants released in exhaust can increase over time, so a car that would have once passed emission standards might slip below acceptable levels. NoSmoke oil additive with StopLeak can not only help reduce or eliminate smoke, but it can also cut down on pollutants released in exhaust to help meet emissions standards. This no smoke oil additive is perfect for maintaining cleaner emissions and protecting your engine.
MAINTAIN AND IMPROVE: Bardahl's NoSmoke + StopLeak is the best motor oil additive for older cars. Not only will it help reduce wear and improve the function of your engine, but it can also restore lost performance and help improve compression over time. Use the best engine oil additive to maintain your car's longevity when you use NoSmoke! This oil additive for car engine treatment is a must-have for any aging vehicle.
A NAME YOU CAN TRUST: For over 85 years, Bardahl has been based in America, making the best oil additive motor products for car engines. We're a family-owned and operated company, and we pride ourselves on producing the finest products on the marketplace while developing industry-leading innovations in engine additive solutions.

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Picked by 397 people today

9.5

Liqui Moly

Liqui Moly Oil Smoke Stop 300 ml (2122) Designed to minimize Blue Exhaust Smoke

Main Highlights

Very high viscosity, seals the gaps caused by wear in the internal parts of the engine
Suitable for all oils usually used in petrol and diesel engines
Additive specially formulated to remove the blue smoke of engines that burn oil
Particularly effective and recommended for old, worn engines subjected to high loads and high temperature

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9.5

MotorPower Care

Engine Oil Stop Leak Engine stop smoke restore seals and gaskets

Main Highlights

Effective and safe formula
Stops engine oil leaks and seals gaskets gap
Prevents oil burning and excessive exhaust smoke
Works with all Gasoline, LPG & Diesel engines
Improves engine oil viscosity properties
Improves compression and engine performance
Decrease engine noises
Reduce oil consumption

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9.2

Rislone

Rislone 4416-5PK Ring Seal Repair, 16 oz, (Pack of 5)

Main Highlights

Stops blue exhaust and reduces oil burning: Ring Seal contains viscosity modifiers and high-shear polymers which provide a seal for worn pistons and rings to stop blow-by.
All weather formula: Retains oil flow characteristic in hot and cold weather.
Works with all gasoline and diesel engines using conventional, high mileage and synthetic oil: High mileage formula is specifically designed for older higher mileage engines
Reduce wear and quiet noisy engines: Viscosity improver cushions and coats engine parts helping to reduce wear and quiet noisy engines.
Use anytime: Can be added anytime, top off oil when low or while changing oil. One bottle treats 4 to 6 quarts of oil for regular 4, 6 and 8 cylinder engines

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9.0

MotorPower Care

MotorPower Care Oil Seal & Smoke Stop Engine Oil Additive for Ford, Lexus, BMW, Mercedes, Audi, VW & More

Main Highlights

Stops Valve Stem Leaks: Seals and repairs leaks from valve stems
Reduces Oil Consumption & Smoke: Minimizes oil burning and exhaust smoke
Avoids Costly Repairs: Prevents expensive engine damage
Fits Various Vehicles: Compatible with a wide range of car makes and models
Keeps Engine Lubricated & Safe: Maintains essential lubrication and engine safety

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8.8

BlueDevil Products

BlueDevil Products 00243 Stop Smoke & Engine Repair - 16 Ounce (Pack of 6)

Main Highlights

Reduces Oil Loss
Stops exhaust smoke
Revitalizes Worn & Damaged Seals
Safe to use in any vehicle engine

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8.6

Bardahl

Bardahl 2117-CS NoSmoke + StopLeak Motor Oil Additive - Treatment for Oil Burning & Excessive Exhaust Smoke - Engine Oil Leak Sealer - Stop Smoke & Quiet Noisy Engines While Restoring - 16 fl oz

Main Highlights

NO MORE BURNING OIL: Stop your engine from oil burning with the enhanced NoSmoke + StopLeak motor oil additive! Bardahl NoSmoke oil additive gives you top-quality protection and restoration for old engines by "filling in" loose tolerances with an extra-thick formula that reduces oil burning and excessive exhaust smoke. This engine additive stop oil burning solution ensures your vehicle runs cleaner and smoother.
LEAK SEALER: NoSmoke + StopLeak doesn't just reduce burn; it helps seal empty spaces that develop in engines over the years, acting as an engine oil leak sealer to reduce engine noise and quiet noisy lifters. It even helps restore the reliability of dry, brittle seals to stem further oil leaks. Your car won't just run better; it'll sound better too. Stop the smoke and the noise with this effective stop leak oil additive!
CONTROL EMISSIONS: As engines loosen, smoke and pollutants released in exhaust can increase over time, so a car that would have once passed emission standards might slip below acceptable levels. NoSmoke oil additive with StopLeak can not only help reduce or eliminate smoke, but it can also cut down on pollutants released in exhaust to help meet emissions standards. This no smoke oil additive is perfect for maintaining cleaner emissions and protecting your engine.
MAINTAIN AND IMPROVE: Bardahl's NoSmoke + StopLeak is the best motor oil additive for older cars. Not only will it help reduce wear and improve the function of your engine, but it can also restore lost performance and help improve compression over time. Use the best engine oil additive to maintain your car's longevity when you use NoSmoke! This oil additive for car engine treatment is a must-have for any aging vehicle.
A NAME YOU CAN TRUST: For over 85 years, Bardahl has been based in America, making the best oil additive motor products for car engines. We're a family-owned and operated company, and we pride ourselves on producing the finest products on the marketplace while developing industry-leading innovations in engine additive solutions.

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8.3

Hot Shot's Secret

Hot Shot’s Secret Original Stiction Eliminator 16 oz – Treats 8 Quarts of Oil – Oil Additive for Gas & Diesel Engines, Reduces Wear, Restores Power, Protects Injectors, Eliminates Injector Stiction

Main Highlights

Restore power and performance of your engine back to new while preventing excessive wear
Cleans and lubricates every component in the oil system, including HEUI injectors, turbos and more
Reduces wear by up to 62% more than engine oil alone, as verified by third-party testing
Restores 9 out of 10 failing HEUI injectors for better performance
Works on both gasoline and diesel engines

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8.1

Red Line

Red Line 81403 Engine Oil Break-In Additive - 16 Ounce

Main Highlights

PROVIDES ADDITIVES - To conventional motor oils with antiwear additives like zinc and phosphorus (ZDDP) necessary to protect against camshaft and valvetrain damage on break-in
MULTI-USE - 16oz bottle treats up to 12 quarts of motor oil--in many cases, one bottle can serve two engines or oil changes, remember to change these oils more frequently than regular motor oils
SPECIAL DETERGENTS - for improved lubricity and less detonation, allows piston rings to seat properly with less-slick oil, while antiwear additives protect other engines components to avoid excessive wear
IMPROVED PROTECTION - at startup, lower oil temp, cleanliness
WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises

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8.1

Bardahl

Bardahl 1560 Full Metal Motor Oil Additive - Car Engine Protection Treatment - ZDDP Formula with C60 Fullerenes Nano Anti-Wear Anti-Friction Formula to Protect & Lower Temperature - 12 fl oz (6 Pack)

Main Highlights

NANO-ENGINEERED: Precision engineered for the tight tolerances of modern car engines Bardahl Full Metal Advanced Oil Treatment works on a molecular level to enhance your oil and add anti-friction wear protection to your engine. Designed to increase the lifespan of your engine protection is maximized during cold starts when your 4 stroke engine is most vulnerable.
REDUCE FRICTION & TEMPERATURE: Full Metal Car Engine Motor Oil Additive extends the life of your engine by reducing the friction it experiences everyday with ultra lubricating C60 Fullerenes which even help lower your operating temperature. This combines with concentrated zinc (ZDDP) to protect against wear and guard against oxidation and corrosion.
EXTEND OIL LIFE: Our advanced friction modifier can extend the life of your motor oil meaning you need to service your engine and change your oil less often. Overtime Full Metal can even help 4 stroke car engines restore compression. Get the best performance from your vehicle when you use the best protection.
THE BEST ENGINE OIL ADDITIVE: The low-viscosity ultra-concentrated zinc ZDDP formula means just one 12 fl oz bottle of Full Metal treats up to 6 quarts (5.7 liters) of motor oil. Our special anti-wear friction modifier formula is compatible with all synthetic and natural motor oils.
A NAME YOU CAN TRUST: For over 85 years Bardahl has been based in America making the best additives in automotives. We're a family owned and operated company and we pride ourselves on producing the finest products on the marketplace while developing industry leading innovations.

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Our Best Overall Choice

Best Choice

9.7

Bardahl

Bardahl 2117 NoSmoke + StopLeak Motor Oil Additive - Treatment for Oil Burning & Excessive Exhaust Smoke - Engine Oil Leak Sealer - Stop Smoke & Quiet Noisy Engines While Restoring Engines - 16 fl oz

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

NO MORE BURNING OIL: Stop your engine from oil burning with the enhanced NoSmoke + StopLeak motor oil additive! Bardahl NoSmoke oil additive gives you top-quality protection and restoration for old engines by "filling in" loose tolerances with an extra-thick formula that reduces oil burning and excessive exhaust smoke. This engine additive stop oil burning solution ensures your vehicle runs cleaner and smoother.
LEAK SEALER: NoSmoke + StopLeak doesn't just reduce burn; it helps seal empty spaces that develop in engines over the years, acting as an engine oil leak sealer to reduce engine noise and quiet noisy lifters. It even helps restore the reliability of dry, brittle seals to stem further oil leaks. Your car won't just run better; it'll sound better too. Stop the smoke and the noise with this effective stop leak oil additive!
CONTROL EMISSIONS: As engines loosen, smoke and pollutants released in exhaust can increase over time, so a car that would have once passed emission standards might slip below acceptable levels. NoSmoke oil additive with StopLeak can not only help reduce or eliminate smoke, but it can also cut down on pollutants released in exhaust to help meet emissions standards. This no smoke oil additive is perfect for maintaining cleaner emissions and protecting your engine.
MAINTAIN AND IMPROVE: Bardahl's NoSmoke + StopLeak is the best motor oil additive for older cars. Not only will it help reduce wear and improve the function of your engine, but it can also restore lost performance and help improve compression over time. Use the best engine oil additive to maintain your car's longevity when you use NoSmoke! This oil additive for car engine treatment is a must-have for any aging vehicle.
A NAME YOU CAN TRUST: For over 85 years, Bardahl has been based in America, making the best oil additive motor products for car engines. We're a family-owned and operated company, and we pride ourselves on producing the finest products on the marketplace while developing industry-leading innovations in engine additive solutions.

Show Price

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