Best Additive To Stop Oil Burning for Worn Engines

#1 · Best Overall

1. Bardahl NoSmoke StopLeak

• Weight: 11.2 oz

Best for: For older engines burning oil.

Why it ranks #1: Its extra-thick formula is specifically described as reducing oil burning and excessive exhaust smoke, while also helping seal leaks in older engines.

Bardahl NoSmoke + StopLeak uses an extra-thick formula to fill loose engine tolerances, directly targeting oil burning and excessive exhaust smoke in older engines. It also combines that approach with leak-sealing claims, making it a fit for owners facing both smoky exhaust and oil seepage.

Bardahl describes the thick formula as reducing oil that passes worn valves and piston rings into the combustion chamber, linking its mechanism to burning and smoke. The added StopLeak function addresses leaks, so one treatment covers two stated symptoms. The instructions say to warm the engine at idle for five minutes before pouring a bottle into the crankcase at an oil change. That warm-up step adds a small but explicit task to the workflow.

Skip it if you prefer not to add a warm-up step; Motor Honey C162-12 lists smoke and oil-burning benefits without that supplied instruction.

Bardahl NoSmoke + StopLeak suits an older engine showing both burning oil and leaks, especially when excess smoke is also a concern. Account for the specified five-minute idle warm-up before adding it to the crankcase.

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

#2 · Best Zinc Treatment

2. Bardahl B2 Engine Protection

• Compatible with Vehicle Type: Car, Truck
• Weight: 7.2 oz
• Size: 12 fl. oz. (Pack of 1)
• Container Type: Bottle

Best for: For older engines under load.

Why it ranks #2: This zinc-based treatment explicitly targets oil burning in older, high-mileage engines and treats up to five quarts of motor oil.

Bardahl B2 combines zinc-based engine protection with an oil-burning guard for older, high-mileage vehicles operating under heavy loads or high temperatures. Its one-bottle capacity of up to five quarts gives owners a clear reference when matching the treatment to an engine’s oil volume.

The product is described as an ultra-concentrated zinc oil treatment that helps protect against wear, deposits, and corrosion while addressing oil burning. Its polar-attraction formula is said to add a triple layer of anti-wear and anti-friction protection. The listed compatibility covers cars and trucks, and directions allow use at each oil change or between changes as needed. One bottle treats up to five quarts, helping define the application limit for routine planning.

Skip it if you have an oil system over five quarts; XADO Engine Oil Additive lists compatibility for systems up to five quarts as well, so check capacity before choosing either.

Bardahl B2 suits older cars and trucks facing oil burning under heavy loads or high temperatures, with added zinc-based wear protection. Match the engine’s oil volume to its five-quart treatment limit and follow the listed crankcase directions.

Listed on Amazon as: Bardahl Engine Protection Motor Oil Additive Zinc ZDDP High Mileage 12 oz

#3 · Best Direct Smoke Claim

3. Motor Honey Oil Treatment

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

Best for: For smoke and noisy engines.

Why it ranks #3: Its listed benefits directly include stopping smoke and reducing oil burning, with a viscosity improver and 14-ounce bottle.

Motor Honey Premium Engine Oil Treatment lists both smoke reduction and quieter engine operation alongside reduced oil burning. That combination makes it a straightforward candidate for owners whose oil-use concern comes with smoky exhaust or noisy engine operation.

The treatment is described as a viscosity improver that coats engine parts, connecting its formula to lubrication and its listed goals of reducing oil burning and quieting noisy engines. The supplied compatibility says various vehicle types, offering broader wording than a car-only listing, though it names no specific categories. Its 14 fl oz bottle is a simple treatment format, but the provided information does not specify a dosage, oil capacity, or application interval.

Skip it if you need a stated application schedule; STP High Viscosity Oil Treatment specifies adding a bottle at every oil change.

Motor Honey suits owners looking for oil-burning and smoke reduction with a stated aim of quieting noisy engines. Its compatibility is described only as various vehicle types, and buyers needing a dosage or service interval will not find one in the supplied details.

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

#4 · Best for Aging Seals

4. Liqui Moly Motor Oil Saver

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

Best for: For aging engine seals.

Why it ranks #4: It targets hardened valve-stem seals and other rubber or plastic seals, aiming to reduce oil consumption, blue smoke, and external leaks.

Liqui Moly Motor Oil Saver targets hardened rubber and plastic seals in the engine oil circuit, including valve stem seals. That focus makes it a relevant option when oil consumption, blue exhaust smoke, or external seepage accompanies aging seals in a gasoline or diesel engine.

The formula maintains and regenerates rubber and plastic seals, addressing a stated source of oil loss rather than relying only on a thicker oil cushion. Liqui Moly says it reduces consumption caused by aged valve stem seals, helps prevent blue smoke, and minimizes external leaks. Its 300 ml bottle is listed for cars, and the supplied description covers both gasoline and diesel engines. It is a targeted seal-care choice, not a broad vehicle-type listing.

Skip it if you need an additive explicitly listed for trucks or motorcycles; this product's vehicle compatibility names cars.

Choose Liqui Moly Motor Oil Saver if an aging car engine shows oil use, blue smoke, or seepage associated with worn seals. Its stated fit is cars with gasoline or diesel engines, so buyers seeking broader vehicle compatibility should look elsewhere.

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

#5

5. Permatex Engine Oil Stop Leak

• Weight: 0.33 kg

Best for: For liquid stop-leak application.

Why it ranks #5: Its product title says it stops and prevents oil leaks and burning without dismantling, making it a relevant option for leak-related symptoms.

Permatex 30302 is a liquid engine-oil stop-leak product whose title says it addresses oil leaks and burning without dismantling the engine. For owners seeking an in-crankcase leak-treatment approach rather than an engine teardown, its stated purpose is direct and uncomplicated.

The product is identified as a 12 fl oz liquid engine-oil stop leak, a form that supports pouring into an engine-oil system rather than handling a solid component. Its stated function is to stop and prevent oil leaks and burning without needing dismantling, which may suit a maintenance workflow where avoiding teardown is the priority. The listed material is rubber and the compatible material is rubber. The supplied facts do not give a dosage, vehicle range, or application interval.

Skip it if you need a stated vehicle range and treatment quantity; Bardahl B2 lists cars and trucks and treats up to five quarts.

Permatex 30302 may suit a buyer seeking a liquid stop-leak treatment that claims to address oil burning without dismantling. The supplied listing gives no vehicle range or dosage, so those details matter when selecting an application.

Listed on Amazon as: Permatex 30302 Engine Oil – Stop Leak, 12 fl oz, Effectively Stops and Prevents Oil Leaks and Burning Without Needing to Dismantle

#6

6. STP High Mileage Oil Treatment

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

Best for: For high-mileage seal and wear care.

Why it ranks #6: Made for vehicles over 75,000 miles, it combines a high-viscosity treatment with ZDDP and seal-and-gasket rejuvenation claims.

STP High Mileage Oil Treatment + Stop Leak is formulated for vehicles with more than 75,000 miles and combines seal-and-gasket rejuvenation with ZDDP anti-wear protection. That pairing addresses leaks and oil burning while also cushioning moving engine parts against metal-to-metal friction.

The high-viscosity formula creates a thicker cushion between moving parts, while ZDDP is included to help protect against wear. Separately, the stop-leak component is described as rejuvenating seals and gaskets to address engine leaks, noise, and smoke. This combination suits high-mileage car owners facing more than one symptom, rather than buyers seeking only compression repair. The supplied compatibility is cars, and the product is specifically framed for vehicles above 75,000 miles.

Skip it if you have a truck or motorcycle; Rislone 4447 lists both among its compatible vehicle types.

Choose this STP treatment for a high-mileage car with oil burning or leaks where seal care and wear protection are both relevant. Its stated mileage focus is over 75,000 miles, and the compatibility listing names cars.

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

#7

7. STP High Viscosity Oil Treatment

• Compatible with Vehicle Type: Car, Truck, SUV
• Weight: 13.9 oz
• Size: 15 Fl Oz (Pack of 1)
• Container Type: Can

Best for: For routine high-viscosity treatment.

Why it ranks #7: Its high-viscosity formula is described as reducing oil consumption and includes ZDDP, but it does not focus on seals or smoke.

STP High Viscosity Oil Treatment combines a thicker oil cushion with ZDDP anti-wear agent to address oil consumption and metal-to-metal friction. Its stated compatibility with conventional and synthetic oils, plus cars, light trucks, and SUVs, makes it adaptable to routine oil-change maintenance.

STP recommends adding a bottle to four or five quarts of oil at each oil change, giving owners a defined maintenance interval and proportion. The high-viscosity formula is intended to cushion moving parts, while ZDDP helps fight metal-to-metal friction. It is compatible with conventional or synthetic oils and is listed for cars, light trucks, and SUVs. That broad fit is useful when oil consumption reduction and wear protection are both priorities.

Skip it if you want an additive focused on regenerating engine seals; Liqui Moly Motor Oil Saver specifically targets rubber and plastic seals.

STP suits owners of cars, light trucks, or SUVs who want a recurring oil-change additive for consumption reduction and friction protection. Follow its stated bottle-to-oil proportion, and consider a seal-focused option if leaks are the main concern.

Listed on Amazon as: STP High Viscosity Oil Treatment, Car Oil Additive, 15 Fl Oz

#8

8. Rislone Compression Repair

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

Best for: For high-mileage compression concerns.

Why it ranks #8: It addresses worn engines with decreased or uneven compression through a ring-seal formula, a potential fit when wear contributes to oil burning.

Rislone High Mileage Compression Repair uses high-shear and premium polymers to address decreased or uneven compression in worn engines. Its ring-seal focus connects oil-burning concerns with sealing between piston rings and cylinder walls, making it relevant when low compression and lost power accompany higher mileage.

The concentrated polymer blend is described as filling scratches and gaps associated with worn engines, helping increase and stabilize compression. Since the listing links low compression to reduced sealing between piston rings and cylinder walls, this approach may suit owners whose oil-use concern appears alongside compression loss. Compatibility includes cars, trucks, motorcycles, and ATVs. The bottle is a broad vehicle-type option, but the supplied details do not give a treatment ratio or service interval.

Skip it if you want a clearly stated oil-change dosage; STP High Viscosity Oil Treatment specifies one bottle per four or five quarts.

Consider Rislone when an older vehicle has oil-burning concerns alongside low or uneven compression and lost power. Its wide listed vehicle compatibility is useful, but buyers who need a stated dosage or maintenance schedule will need another option.

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

#9

9. Bar's Leaks Engine Repair

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

Best for: For high-mileage oil-leak checks.

Why it ranks #9: Verified details say it works with petroleum, synthetic, and high-mileage oils, but supplied facts do not directly describe an oil-burning benefit.

Bar's Leaks High Mileage Engine Repair is listed as compatible with petroleum, synthetic, and high-mileage engine oils, giving owners flexibility across common oil types. Its product information also addresses dark spots or puddles and low oil readings when the source of oil loss is unclear.

That all-oil compatibility can simplify selection for drivers who do not want to switch from their current oil formula. The supplied facts frame the product around high-mileage engine repair and possible leak symptoms, including dark golden-brown or black spots beneath a car. They also note low oil levels when a leak is uncertain. The listing identifies car compatibility, so it is a narrower vehicle fit than products explicitly naming trucks or motorcycles.

Skip it if you need an additive explicitly listed for trucks or motorcycles; Rislone 4447 includes those vehicle types.

Bar's Leaks is worth considering for a car owner investigating oil loss who wants compatibility with petroleum, synthetic, or high-mileage oil. Its vehicle listing is car-only, so owners of other vehicle types should choose a broader-listed product.

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

#10

10. XADO Engine Oil Additive

• Compatible with Vehicle Type: Car
• Size: up to 5qt of oil capacity
• Container Type: Bottle

Best for: For oil-system wear protection.

Why it ranks #10: It is a wear-protection metal conditioner compatible with several engine and oil types, but its supplied facts do not claim to reduce oil burning.

XADO Engine Oil Additive treats oil systems up to five quarts and is compatible with full-synthetic through mineral oils. Its revitalization cycle takes 600 to 900 miles, making it a defined longer-term option for owners seeking wear protection and rebuilding of worn metal surfaces.

The stated capacity limit helps buyers judge whether the product matches their engine’s oil system before use. Compatibility spans gasoline, natural-gas, and diesel passenger cars and trucks, plus four-stroke motorcycles, and it can be combined with all types of motor oil. The 600-to-900-mile revitalization cycle also affects maintenance planning: the listing says not to change oil during that period. This is a wear-focused treatment, not a specifically stated seal-rejuvenation product.

Skip it if you need a seal-focused treatment for visible seepage; Liqui Moly Motor Oil Saver specifically targets rubber and plastic engine seals.

XADO suits owners seeking metal-surface wear protection across listed engine fuels and oil types, provided the oil system is within five quarts. Plan around its 600-to-900-mile cycle, when the listing advises against changing oil.

Listed on Amazon as: XADO Engine Oil Additive/Protection For Motor/Additive For Wear Protection & Rebuilding Of Worn Metal Surfaces/Metal Conditioner With Revitalizant 1 Stage Maximum (Up To 5qt Of Oil Capacity)