Liqui Moly Oil Smoke Stop engine oil additive 300 ml — reduces blue exhaust smoke, restores compression

Liqui Moly Oil Smoke Stop 300 ml is an engine oil additive formulated to reduce blue exhaust smoke and help restore compression in engines that consume excessive oil.

This concentrated treatment is designed for petrol and diesel engines showing signs of oil burning. Using a high-performance viscosity index improver, Oil Smoke Stop raises base oil viscosity where wear has thinned the lubricating film, helping to seal gaps formed by worn rings, guides, and seals. It can be added during an oil change or used between services if oil consumption is particularly high, delivering lasting viscosity control and smoke reduction without changing the oil type you already use.

How does it reduce blue exhaust smoke?

The formula thickens the lubricating film and conditions seals and rings to limit oil reaching the combustion chamber. By increasing effective oil viscosity in critical areas, combustion of excess oil is reduced, which lowers visible blue smoke emissions.

• Highly concentrated viscosity index improver for persistent effect
• Seals minor leaks in piston rings and valve guides
• Compatible with standard petrol and diesel engine oils
• Can be dosed at oil change or between services for heavy consumption

Will it improve engine compression and drivability?

Oil Smoke Stop helps recover compression by restoring a fuller oil film that supports sealing surfaces. Improved sealing at rings and guides can reduce blow-by and stabilize compression, which often results in smoother idle and more consistent throttle response.

• Helps re-establish sealing where wear has reduced oil film thickness
• Targets engines with elevated oil consumption and worn components
• May improve low-end torque and reduce rough idling related to blow-by

Is it safe to use with my current engine oil and vehicle?

Yes — the product is formulated to be compatible with the common mineral and synthetic oils used in petrol and diesel engines. It is intended as an additive to existing oils; follow dosage recommendations and avoid mixing with unusual specialty fluids without consulting guidelines.

• Works with most standard engine oils used in modern vehicles
• Not a replacement for routine maintenance or major repairs
• Add at oil change or top-up as directed on the product label

How and when should I add Oil Smoke Stop?

Add the contents according to the manufacturer dosing instructions — typically into the crankcase at the time of an oil change. For engines with very high oil consumption, partial top-ups between changes are acceptable; consistent use often produces the best long-term effect.

• Add at oil change for an even mix throughout the oil
• Can be added between oil changes if consumption is very high
• Follow recommended volume-to-oil ratios on the bottle for correct dosing

Who is this for? Liqui Moly Oil Smoke Stop 300 ml is aimed at owners of older or heavily used petrol and diesel engines that are consuming oil and producing blue smoke. It suits do-it-yourself mechanics, professional workshops, and fleet operators who want a practical additive to reduce visible smoke and support compression recovery without immediate engine overhaul. It is not a permanent cure for severe mechanical failure, but an effective treatment to extend service intervals and improve day-to-day drivability when wear is the primary cause of oil burning.