Liqui Moly Smoke Stop Oil reduces oil consumption and prevents blue smoke and oil mist in gasoline and diesel engines by improving sealing via piston rings and valve guides. It protects engines with high wear, lowers engine noise, and helps extend catalytic converter life. Suitable for all common motor oils, one 300 ml can treats 4 to 6 liters of motor oil, added to warm oil during oil changes or between changes if consumption is high. Not for motorcycles with wet clutches.