Top Smoke-Reducing Engine Oil Additives (Diesel & Petrol)

By on 7 November 2023 / Leave a comment Updated on: 7th November 2023

Seeing smoke behind your car is never a good sight. However, it doesn’t always mean your car is beyond repair or that you’ll face massive bills. It’s often a sign that your vehicle needs some care to perform at its best.

Blue smoke occurs when excess oil burns in the wrong places, usually in the engine’s combustion chamber. Over time, as your engine goes through heat cycles and mileage, its components can wear out and allow oil to leak where it shouldn’t, causing smoke and reduced engine performance.

Reducing Smoke with Oil Additives

Adding smoke-reducing agents to your engine oil can help prevent excess smoke. These agents thicken the oil, reducing the chance of oil-burning problems. They also create a protective layer on internal engine parts, reducing wear.

These additives also rejuvenate seals and gaskets, which keep oil, fuel, and water separate in the combustion chamber. This restores your engine’s efficiency and eliminates excess smoke.

Smoke Reduction Oil Additives: Your Options

1. JLM Stop Smoke Oil Treatment

JLM Stop Smoke
Product NameJLM Stop Smoke Oil Treatment
DescriptionJLM Stop Smoke Oil Treatment is a specialized additive designed to address common issues in older engines with worn parts. It is compatible with petrol, diesel, LPG, and CNG engines that produce blue/grey exhaust smoke. This product is formulated to reduce exhaust smoke, engine wear, and oil consumption, ultimately improving engine performance.
BenefitsReduces engine noise
Reduces exhaust smokeImproves viscosity of the engine oil
Reduces oil consumptionProlongs engine service life
Enhances engine compression
Compatible with various types of engine oils
Safe for catalytic converters
Cleans and revitalizes engine components including cylinder walls, pistons, rings, valves, lifters, and the upper cylinder area
ProsAddresses multiple engine issues
Suitable for older engines with worn parts
Versatile and compatible with various engine types
Reduces exhaust smoke and engine noise
Extends engine service lifeMaintains catalytic converter integrity
Cleans and revitalizes critical engine components
ConsSpecific benefits may vary depending on engine condition
Not a substitute for essential engine maintenance and repairs

JLM Stop Smoke Oil Treatment is a versatile solution for enhancing the performance and longevity of older engines experiencing issues like smoke emissions, increased noise, and oil consumption.

It is compatible with a range of engine types and can be easily mixed with different oils. While it offers several benefits, it’s important to note that its effectiveness may depend on the specific condition of the engine, and it should not replace necessary maintenance and repairs when required.

2. Wynn’s Stop Smoke Oil Treatment

Wynns Stop Smoke
Product NameWynn’s Stop Smoke Oil Treatment 325ml
DescriptionWynn’s Stop Smoke Oil Treatment is a comprehensive solution designed to combat exhaust smoke resulting from oil burning in engines. This oil-soluble supplement is tailored for older engines with worn components, compatible with petrol, LPG, and diesel engines.
Features and BenefitsEnhances oil viscosity at high temperatures
Seals gaps between worn engine components
Improves engine compression for enhanced performance
Reduces engine noise
Forms a durable protective oil film under high-temperature conditions
Compatible with mineral, synthetic, single, and multigrade oils
ProsAddresses issues related to oil burning and exhaust smoke
Suitable for older engines with worn components
Versatile, compatible with various oil types
Enhances engine performance and reduces noise
Safe for catalytic converters, ensuring emissions system integrity
ConsEffectiveness may vary based on engine condition
Should not replace essential engine maintenance and repairs

Wynn’s Stop Smoke Oil Treatment (325ml) is a powerful solution for reducing exhaust smoke in older petrol, LPG, and diesel engines.

It improves oil viscosity, seals gaps in worn engine parts, reduces engine noise, and won’t harm catalytic converters. Just add it to warm engine oil, and one can treats 3 to 6 liters.

Remember, it’s not a replacement for necessary engine maintenance.

3. Stop Smoke Oil Additive Treatment

Stop Smoke Oil Additive Treatment
Product NameStop Smoke Oil Additive Treatment 325ml
DescriptionStop Smoke Oil Treatment is a 325ml additive designed to improve oil viscosity, creating a protective barrier that seals gaps in worn engine components. This seal reduces oil consumption, minimizes blue smoke emissions, and enhances overall engine efficiency.
Features and BenefitsImproved Oil Viscosity
Reduced Oil Consumption
Diminished Engine Noise
Elimination of Blue Smoke Emissions
ProsReduces oil consumption
Diminishes engine noise
Eliminates blue smoke emissions
ConsLimited information provided
Specific benefits may vary depending on engine condition

Stop Smoke Oil Additive Treatment in a 325ml container is formulated to enhance oil viscosity, resulting in a protective barrier that effectively seals gaps in worn engine components.

This sealing action reduces oil consumption, minimizes blue smoke emissions, and contributes to improved engine efficiency.

4. Liqui Moly Oil Smoke Stop

Oil Smoke Stop
Product NameEngine Oil Additive
DescriptionThis engine oil additive is designed to reduce oil consumption in both gasoline and diesel engines by targeting piston rings and valve guides. It prevents blue smoke and oil mist while combatting the loss of viscosity in motor oil.

The result is improved engine sealing and reduced noise, along with additional protection for engines with high wear levels. Furthermore, it extends the service life of catalytic converters.
Features and BenefitsReduces Oil Consumption
Stabilizes Loss of Viscosity
Prevents Blue, Smoky Exhaust Fumes
High Shear Stability
Extends Catalytic Converter Service Life
Reduced Oil Consumption
Improved Sealing and Reduced Engine Noise
Enhanced Protection for High-Wear Engines
Compatibility with Various Engines
Compatible with Commercially Available Motor Oils
ProsReduces oil consumption
Stabilizes loss of viscosity
Prevents blue, smoky exhaust fumes
Provides extra protection for high-wear engines
Extends the service life of catalytic converters
Suitable for all types of gasoline and diesel engines
Compatible with commercially available motor oils
ConsNot suitable for use in motorbikes with wet clutches
Requires precise dosage (not more than 10% of motor oil)

This Engine Oil Additive is a high-performing solution for reducing oil consumption in gasoline and diesel engines, particularly via the piston rings and valve guides.

It effectively prevents blue smoke and oil mist, combats viscosity loss in motor oil, and results in improved engine sealing and reduced noise.

This product is suitable for a wide range of engines, compatible with various motor oils, and extends the life of catalytic converters.

However, it’s important to note that it should not be used in motorbikes with wet clutches, and its dosage should not exceed 10% of the motor oil.

5. Ametech RESTORE Engine Restorer & Lubricant

Product NameAmetech RESTORE Engine Restorer & Lubricant (Two 250ml Cans)
DescriptionThis listing includes two 250ml cans (totaling 500ml) of Ametech RESTORE Engine Restorer & Lubricant. It’s designed to treat engines, with specific dosages for different engine sizes and mileage conditions.

The product is formulated to remetalize engine surfaces, reducing wear and friction, and it offers a range of benefits for your vehicle’s engine.
Features and BenefitsTwo Cans
Dosage Variability
Remetalizing Formula
Wide Applicability
Engine Performance
Fuel Efficiency
Versatile Solution
ProsTreats various engine sizes and mileage conditions
Restores compression, engine power, and engine life
Reduces oil and fuel consumption
Addresses multiple engine issues, including blue smoke, low compression, high oil consumption, and more
Suitable for a wide range of engines, including those with catalytic converters and turbochargers
ConsDosages are approximate
Requires driving at least 1000 miles to complete the repair
May not help with manually adjusted tappets

This Ametech RESTORE Engine Restorer & Lubricant package contains two 250ml cans (500ml total) and is suitable for treating engines with varying sizes and mileage conditions.

It can be used as a curative treatment for older engines with more than 40,000 miles or as a preventative treatment for newer engines with up to 4 liters.

The product’s benefits include restoring compression, engine power, and engine life, as well as reducing oil and fuel consumption.

6. STP Smoke Treatment

STP Smoke Treatment
Product NameSTP Smoke Treatment (14.5 Fluid Ounces)
DescriptionSTP Smoke Treatment is formulated to combat exhaust smoking and minimize metal-to-metal contact within your engine by creating a thick oil cushion.

It’s designed to address issues like noisy valves, lifters, and oil burning caused by oil blow-by. The product contains 14.5 fluid ounces.
Features and BenefitsExhaust Smoke Reduction
Metal-to-Metal Contact Reduction
Noise Reduction
Oil Burning Reduction
Engine Performance Improvement
Enhanced Engine Longevity
Quieter Operation
Fuel Efficiency
Convenient Dosage
ProsReduces exhaust smoking
Mitigates metal-to-metal contact, reducing wear and tear
Quiets noisy valves and lifters
Decreases oil burning and engine smoking
Provides a thick oil cushion for added protection
One bottle treats 4-5 quarts of oil
ConsSpecific benefits may vary depending on the engine’s condition

STP Smoke Treatment, available in a 14.5 fluid ounces container, is a targeted solution to reduce exhaust smoking and diminish metal-to-metal contact within your engine.

It creates a protective, thick oil cushion to address common engine issues, including noisy valves and lifters, as well as oil burning caused by oil blow-by.

Common Engine Problems and Additive Solutions

Your vehicle’s engine, like any other mechanical component, is prone to various issues over time. These problems can range from increased exhaust smoke to reduced engine performance and increased oil consumption.

Fortunately, engine additives offer effective solutions to address these common challenges. In this section, we will explore these issues and how the right engine additives can provide the necessary remedies.

1. Increased Exhaust Smoke


One of the most noticeable engine problems is increased exhaust smoke. This is often caused by excess oil entering the combustion chamber and burning alongside fuel.

This condition, known as oil blow-by, results from wear and friction in the engine, leading to gaps between cylinder walls, piston rings, and valve guide seals.

Additive Solution:

Engine additives, specifically designed to reduce oil blow-by, can effectively combat increased exhaust smoke.

By filling in scratches and restoring worn engine surfaces, these additives reduce friction and restore the engine’s performance.

This not only addresses the issue of blue smoke emissions but also helps enhance engine efficiency.

2. Reduced Engine Performance


Over time, engines may experience reduced performance, resulting in sluggish acceleration, decreased power output, and a general lack of responsiveness.

This can be attributed to wear and tear on engine components and the accumulation of deposits in the fuel system.

Additive Solution:

Fuel system cleaners are valuable engine additives for addressing reduced engine performance. They help remove deposits and impurities from the fuel system, enhancing fuel combustion and restoring power and responsiveness.

Additionally, oil treatments can improve engine efficiency by reducing friction, contributing to better overall performance.

3. Increased Oil Consumption


Engines that consume excessive amounts of oil between oil changes are a cause for concern. This issue is often due to oil escaping the intended pathways and entering the combustion chamber, where it is burned along with fuel.

Additive Solution:

Oil treatments are designed to address this issue by improving oil viscosity and creating a protective barrier in the engine.

This effectively seals gaps in worn engine components, reducing oil consumption and the need for frequent top-ups. By maintaining the engine’s lubrication, these additives also extend the engine’s service life.

In conclusion, engine additives play a crucial role in resolving common engine problems such as increased exhaust smoke, reduced engine performance, and high oil consumption.

By selecting the appropriate additives and following recommended usage guidelines, car owners can effectively maintain their engines and enjoy improved performance and longevity.

Future Trends in Engine Additives: Embracing Technological Advancements

As automotive technology continues to advance, the world of engine additives is also evolving to meet the changing needs of modern vehicles.

The future of engine additives holds exciting possibilities, thanks to emerging trends and innovative technologies. Here, we explore how these trends are shaping the future of these products.

1. Advanced Formulations

The future of engine additives lies in more advanced and precisely engineered formulations. Manufacturers are investing in research and development to create additives that are tailor-made for specific engine types, making them even more effective in addressing engine issues.

2. Nanotechnology

One of the most promising trends in engine additives is the integration of nanotechnology. Nanoparticles can penetrate engine components at a microscopic level, providing enhanced protection and performance. These tiny particles can reduce friction, improve lubrication, and prevent wear and tear, leading to greater engine efficiency.

3. Environmental-Friendly Solutions

With a growing emphasis on environmental responsibility, future engine additives are expected to focus on reducing emissions. Additives that contribute to cleaner combustion and extend the life of emissions control systems like catalytic converters are gaining traction.

4. Data-Driven Additives

The incorporation of data-driven technologies is on the horizon. Some additives may be equipped with sensors and data collection capabilities to monitor engine performance in real time. This data can help users optimize additive usage and track the health of their engines more effectively.

5. Synthetic Oil Additives

Synthetic oils are becoming increasingly popular due to their superior properties. Engine additives designed specifically for synthetic oils are expected to grow in demand. These additives will work in harmony with synthetic oils to provide exceptional engine protection and performance.

6. Compatibility with Alternative Fuels

As the automotive industry explores alternative fuels, engine additives will need to adapt. Additives that work seamlessly with fuels like hydrogen, electricity, and biofuels will become essential for maintaining engine health and performance.

7. Personalized Solutions

Customizable engine additives may become a reality. Users could tailor the additives to their specific driving conditions, engine types, and performance requirements, creating a more personalized and efficient solution.

8. Smart Dispensing Systems

Automated systems that dispense engine additives at optimal times and in precise amounts could become a reality. These systems would work in conjunction with vehicle onboard computers to ensure the additives are used effectively.

9. Eco-Friendly Packaging

Future trends include environmentally friendly packaging for engine additives, reflecting the overall shift toward sustainability in the automotive industry.


In the world of automobiles, engine additives are the unsung heroes, offering effective solutions to common engine problems. Whether you’re dealing with increased exhaust smoke, reduced engine performance, or high oil consumption, these specialized additives have your back.

By addressing issues like oil blow-by, friction, and deposit build-up, engine additives provide a cost-effective means of restoring your engine’s health and vitality. They not only reduce smoke emissions but also enhance engine performance, reduce oil consumption, and prolong the engine’s service life.

So, the next time you notice your engine struggling, don’t fret. Consider the power of engine additives, your secret weapon to keep your vehicle running smoothly, efficiently, and smoke-free. A little care today can go a long way in ensuring the longevity and performance of your beloved car.


What can I add to my engine oil to stop smoking?

To reduce smoke emissions from your engine, you can add an engine oil treatment or stop smoke additive. These additives are specially formulated to improve oil viscosity, seal gaps in worn engine components, and prevent oil from entering the combustion chamber. They effectively address the issue of smoking exhaust caused by oil burning.

Can oil treatment stop smoking?

Yes, oil treatments or engine additives can effectively reduce smoking from your engine. These products work by improving oil viscosity, creating a protective barrier, and sealing gaps in worn engine components. This prevents oil from entering the combustion chamber and burning, ultimately reducing or eliminating smoking issues.

What fuel additive reduces smoke?

While most fuel additives are primarily designed to clean fuel systems and improve combustion, they can indirectly contribute to reducing smoke emissions by ensuring a more efficient and cleaner burn of fuel. These additives can lead to reduced emissions, including smoke, by optimizing the combustion process.

What oil additive stops burning oil?

Engine oil additives, specifically designed to address oil consumption and burning issues, can effectively stop oil from burning in your engine. These additives improve oil viscosity, create a protective barrier, and seal gaps in worn engine components, preventing oil from entering the combustion chamber and burning. This, in turn, stops the problem of burning oil.

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Jack Gill

Car journalist and fully qualified mechanical engineer, Czok’s newest contributor and long-time automotive writer. Lifetime passion for all things automotive, from new supercars to rusty old hatchbacks. If I’m not behind the wheel, I’m likely under the bonnet or browsing the classifieds. Having spent over 5 years in the automotive industry and under the bonnet of my own car at home, I want to share the knowledge and learning that I have gained, with others without the time to study or the expertise, who just want their car to get them from A to B every day. We aren’t all interested in trawling through endless internet pages and forums. I aim to gather all the information up and roll it into a quick summarised format, to give only the information you really need.

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