Best Oil Additive To Stop Smoke for Worn Engines

#1 · Best Overall

1. BlueDevil Stop Smoke

• Weight: 1 lb

Best for: Pour-in seal repair for high mileage.

Why it ranks #1: Specifically targets blue and white smoke caused by oil burning, revitalizes worn seals, and uses a no-solids pour-in formula for high-mileage engines.

A non-clogging formula with no solids distinguishes BlueDevil Pour-N-Go Stop Smoke & Engine Repair. Its simple pour-in application targets blue or white smoke and oil consumption caused by worn seals, giving high-mileage owners a seal-focused treatment.

BlueDevil says the additive revitalizes dried, cracked, or shrunken oil seals, helping reduce oil loss and smoke caused by worn seals. Its no-solids formula is described as safe for all engine components, a relevant detail for buyers concerned about introducing a treatment into the oil system. The product works while driving as it absorbs into seals to soften and expand them. The 16-ounce pour-in format supports a simple application, with protective eyewear and avoiding skin contact listed as safety precautions.

Skip it if you want a product explicitly specified for petrol, LPG, and diesel engines; Wynn's Stop Smoke 325 ml lists all three.

BlueDevil suits high-mileage owners seeking a pour-in treatment for smoke and oil loss linked to worn seals. Its listed safety precautions include protective eyewear and avoiding skin contact during handling.

Listed on Amazon as: BlueDevil Pour-N-Go Stop Smoke & Engine Repair | 16 oz. | Pack of 1

#2 · Best for Blue Smoke

2. Liqui Moly Oil Smoke Stop

• Weight: 0.26 kg
• Compatible with Vehicle Type: Car, Truck
• Size: 300 milliliters
• Container Type: Can

Best for: Blue-smoke worn-engine treatment.

Why it ranks #2: Designed to minimize blue exhaust smoke in oil-burning engines; its 300 ml high-viscosity formula is described as suitable for petrol and diesel oils.

A very-high-viscosity formula is the defining feature of Liqui Moly Oil Smoke Stop. It is formulated to minimize blue exhaust smoke from oil-burning engines by sealing wear-related gaps, with particular emphasis on older engines working under high loads and temperatures.

The viscosity improver is intended to maintain a higher oil viscosity at elevated temperatures, which can help address blue smoke as an engine works under load. Liqui Moly says the additive suits oils usually used in petrol and diesel engines, so it can fit either fuel type without a stated oil-brand restriction. Its 300 ml can is a compact addition to an oil-maintenance routine, and the product description says its effect lasts over an extended length of time.

Skip it if you want a treatment explicitly addressing elastomeric seals and external drips; Liqui Moly Motor Oil Saver 300 ml lists those functions.

Choose this for an older petrol or diesel engine showing blue smoke, especially when it operates under high load or temperature. Its stated focus is oil-related smoke, rather than a broad list of external leak concerns.

Listed on Amazon as: Liqui Moly Oil Smoke Stop 300 ml (2122) Designed to minimize Blue Exhaust Smoke

#3 · Best Smoke and Leak Sealer

3. Bardahl NoSmoke + StopLeak

• Weight: 11.2 oz

Best for: Older engines with oil burning.

Why it ranks #3: Addresses both oil burning and excessive exhaust smoke with an extra-thick formula, and also aims to seal leaks in older engines.

An extra-thick formula that fills loose engine tolerances is the defining feature of Bardahl NoSmoke + StopLeak. It targets oil burning and excessive exhaust smoke in older engines, while its leak-sealing role also addresses oil escaping past worn engine components during everyday operation.

Bardahl combines its extra-thick formula with a stop-leak function, giving owners of older engines one additive aimed at both oil burning and leaks. The directions call for adding one bottle to the crankcase at each oil change, after warming the engine at idle for five minutes; that gives a clear maintenance routine rather than an unspecified top-up schedule. Its 16-ounce bottle is the stated size, so plan around the oil-change interval rather than assuming it is a one-time repair.

Skip it if you need an additive explicitly specified for petrol and diesel engines; Wynn's Stop Smoke 325 ml lists petrol, LPG, and diesel applications.

Older-car owners addressing oil burning and leaks together may appreciate Bardahl’s dual-purpose formula and defined oil-change routine. It suits a maintenance approach, but the directions call for repeating treatment at each oil change.

Listed on Amazon as: Bardahl NoSmoke StopLeak Motor Oil Additive Oil Burning Leak Sealer 16 oz

#4 · Best for Multiple Fuel Types

4. Wynn's Stop Smoke

• Weight: 0.31 kg
• Compatible with Vehicle Type: Car
• Size: 325ml
• Container Type: Bottle

Best for: Older engines with blue-gray smoke.

Why it ranks #4: Targets exhaust smoke from oil burning and is listed for petrol, LPG, and diesel engines, with a 325 ml bottle.

Wynn’s Stop Smoke combines smoke reduction with improved oil viscosity at high temperatures. It is aimed at oil-burning engines with excessive blue or gray exhaust smoke, particularly older engines with worn components, and is listed for petrol, LPG, and diesel use.

Its oil-soluble supplement is intended to improve viscosity properties at high oil temperatures and seal gaps between worn engine components. Those functions connect directly to its stated goals of reducing oil-burning smoke and improving compression. Wynn’s also lists a stronger protective oil film under high-temperature conditions and reduced engine noise, useful considerations for older engines in operation. Compatibility covers petrol, LPG, and diesel engines, while the 325 ml bottle provides the stated treatment size.

Skip it if you want a product explicitly targeting valve stem seal leaks; MotorPower Care Valve Stem Seal Leak Repair names that issue.

Wynn’s is a fit for owners of older petrol, LPG, or diesel engines with blue or gray oil-burning smoke, especially under high temperatures. Its stated use centers on that smoke pattern.

Listed on Amazon as: Wynn's Stop Smoke 325 ml

#5

5. MotorPower Care Valve Seal Repair

• Weight: 12 oz
• Compatible with Vehicle Type: Bus, Truck, Van
• Container Type: Bottle

Best for: Valve-stem-seal smoke concerns.

Why it ranks #5: Focuses on valve stem seal leaks, oil consumption, and exhaust smoke, making its listed repair target specific to a common oil-burning symptom.

A specific focus on valve stem seal leaks sets MotorPower Care’s additive apart. It is presented as a way to cut oil consumption and exhaust smoke associated with those leaks, making it relevant to owners seeking an oil additive before considering mechanical repair.

The product links valve stem seal leak repair with reduced oil consumption and exhaust smoke, giving its smoke-reduction purpose a named engine-seal target. MotorPower Care also says it works with many vehicle types and lists buses, trucks, and vans in its compatibility specifications, which helps commercial-vehicle owners assess relevance. The stated benefit of preserving engine lubrication and safety adds an operating consideration, while the supplied details do not describe a specific dosing schedule or engine-oil type.

Skip it if you want a treatment with explicit petrol and diesel compatibility; Wynn's Stop Smoke 325 ml lists both, plus LPG engines.

MotorPower Care suits owners of listed buses, trucks, or vans who associate smoke and oil use with valve stem seal leaks. The supplied details do not specify fuel compatibility, so account for that before choosing.

Listed on Amazon as: Valve Stem Seal Leak Repair & Engine Oil Additive to Stop Leak & Smoke for Ford, Lexus, BMW, Mercedes, Audi, VW & More by MotorPower Care

#6

6. Liqui Moly Motor Oil Saver

• Weight: 11.52 oz
• Compatible with Vehicle Type: Car
• Size: 300 milliliter
• Container Type: Bottle

Best for: Rubber-seal oil consumption care.

Why it ranks #6: Claims to reduce blue, smoky exhaust by addressing oil consumption through piston rings and valve guides, while also regenerating rubber and plastic seals.

Regenerating rubber and plastic engine seals is the central focus of Liqui Moly Motor Oil Saver. It targets oil consumption through piston rings and valve guides, while also addressing blue smoky exhaust and external leaks linked to aging seals.

Liqui Moly says the additive maintains and regenerates seals in the engine oil circuit, including rubber and plastic components. That makes it relevant when hardened valve-stem seals contribute to oil consumption, while its listed reduction of leaks at elastomeric seals addresses oil escaping externally. The product is specified for cars and is described for gas and diesel engines. Its 300 ml size suits a planned oil-maintenance task, though the supplied facts do not give a dosing schedule.

Skip it if you want an additive explicitly listed for trucks and motorcycles; Rislone High Mileage Compression Repair includes both vehicle types.

This suits car owners with oil consumption, blue smoke, or leaks associated with engine seals, including gas and diesel applications. Its listed vehicle compatibility is cars, so other vehicle owners should note that boundary.

Listed on Amazon as: LIQUI MOLY Motor Oil Saver | 300 ml | Oil additive | SKU: 2020

#7

7. STP High Mileage Oil Treatment

• Weight: 15.2 oz
• Compatible with Vehicle Type: Car
• Size: 15 OZ
• Container Type: Bottle

Best for: High-mileage seal and wear care.

Why it ranks #7: Combines stop-leak claims with smoke reduction for vehicles over 75,000 miles and includes ZDDP as an anti-wear agent.

A high-viscosity treatment with ZDDP anti-wear agent gives STP High Mileage Oil Treatment + Stop Leak a dual focus on friction protection and worn seals. It is formulated especially for vehicles with over 75,000 miles, where smoke and leaks accompany other high-mileage concerns.

STP says the thick cushion between moving engine parts helps fight metal-to-metal friction, while ZDDP serves as an anti-wear agent. Separately, the stop-leak formula is intended to rejuvenate seals and gaskets and address leaks, noise, and smoke. That combination suits owners looking beyond smoke alone in a vehicle over 75,000 miles. The listing identifies cars as the compatible vehicle type and gives a 15-fluid-ounce bottle size for planning an oil-treatment routine.

Skip it if you need stated compatibility with trucks or motorcycles; Rislone High Mileage Compression Repair lists both, as well as cars and ATVs.

STP fits car owners above 75,000 miles who want smoke and leak attention alongside friction protection. Its stated vehicle fit is cars, making that the clearest boundary for buyers evaluating other vehicle types.

Listed on Amazon as: STP High Mileage Oil Treatment + Stop Leak, Improves Car Oil, 15 Fl Oz

#8

8. Motor Honey Engine Treatment

• Weight: 13.6 oz
• Compatible with Vehicle Type: Various vehicle types
• Size: 14 oz
• Container Type: Bottle

Best for: Simple smoke and oil-burning treatment.

Why it ranks #8: Its listed benefits directly include stopping smoke and reducing oil burning, though the product details give less specific compatibility information.

A viscosity improver that also coats engine parts gives Motor Honey Premium Engine Oil Treatment a straightforward combination of smoke and wear-related aims. Its listed functions include reducing oil burning and quieting noisy engines, with compatibility stated for various vehicle types.

Motor Honey pairs smoke reduction with reduced oil burning, so it addresses two closely related concerns for owners monitoring exhaust and oil use. Its viscosity-improver role and engine-parts coating provide a separate lubrication-oriented benefit, while the listed noise reduction may matter when an engine has become noisy. The product is described for various vehicle types, but the supplied facts do not name specific fuels, engine conditions, or a dosing schedule; buyers should weigh that limited application detail.

Skip it if you need explicit petrol and diesel compatibility; Liqui Moly Oil Smoke Stop 300 ml lists suitability for both engine types.

Motor Honey suits owners seeking a simple treatment for smoke, oil burning, and engine noise across various vehicle types. Its application details are less specific, so it may not suit buyers needing fuel or schedule guidance.

Listed on Amazon as: Motor Honey C162-12 Premium Engine Oil Treatment, 14 fl. oz.

#9

9. Rislone Compression Repair

• Weight: 500 g
• Compatible with Vehicle Type: Car, Truck, Motorcycle, ATV, etc.
• Size: Pack of 1
• Container Type: Bottle

Best for: High-mileage compression concerns.

Why it ranks #9: Targets worn piston rings and decreased or uneven compression, which can relate to oil-burning problems, but its listed claims focus on compression repair.

A concentrated blend of high-shear and premium polymers distinguishes Rislone High Mileage Compression Repair with Ring Seal. It targets decreased or uneven compression in higher-mileage engines, connecting worn piston-ring sealing with potential losses in engine power and oil control.

Rislone identifies decreased sealing between piston rings and cylinder walls as one cause of low compression, and its polymers are intended to fill scratches in those areas. That makes it a more compression-focused option for owners whose concern includes uneven compression, rather than smoke alone. The product is listed for cars, trucks, motorcycles, and ATVs, offering broad stated vehicle coverage; its 16.9-ounce bottle is a practical addition to a maintenance plan for a high-mileage engine.

Skip it if you want a product specifically labeled to reduce exhaust smoke; Wynn's Stop Smoke 325 ml directly lists that application.

Consider Rislone when a high-mileage engine’s smoke concern accompanies decreased or uneven compression, and the vehicle falls within its broad listed applications. It is less directly targeted if smoke reduction is your only stated concern.

Listed on Amazon as: Rislone 4447 High Mileage Compression Repair with Ring Seal, 16.9 oz.

#10

10. Bar's Leaks Engine Repair

• Weight: 1.1 lb
• Compatible with Vehicle Type: Car
• Size: 1 Pack
• Container Type: Can

Best for: High-mileage oil leak concerns.

Why it ranks #10: The supplied details identify it as a high-mileage engine repair compatible with several oil types, but do not specifically claim smoke reduction.

Compatibility with petroleum, synthetic, and high-mileage engine oils is the clearest practical differentiator of Bar’s Leaks 1000 High Mileage Engine Repair. It gives car owners using different oil formulas a stated compatibility option when investigating low oil levels or spots beneath the vehicle.

The supplied facts specifically confirm compatibility with petroleum, synthetic, and high-mileage oils, so owners do not need to switch among those oil types simply to use the product. Bar’s Leaks lists this as a high-mileage engine repair, while the accompanying information calls out dark spots or puddles and low oil readings as signs owners may be investigating. The listing identifies cars as the compatible vehicle type; it does not provide a detailed smoke-reduction mechanism or treatment schedule.

Skip it if you need an additive with a specifically described blue-smoke treatment; Liqui Moly Oil Smoke Stop 300 ml states that purpose.

This is a straightforward option for car owners using petroleum, synthetic, or high-mileage oil who are investigating oil loss. Its supplied fit information names cars, so buyers with other vehicle types should look elsewhere.

Listed on Amazon as: Bar's Leaks 1000 High Mileage Engine Repair, 16.9 oz, 1-Pack