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Increased pressure of crankcase blow-by gases
Smoke leaks through the oil level gauge, the oil is pressured into the ventilation system manifold due to increased pressure of crankcase gases. These gases literally “blow by” the piston rings. It can be the result of contamination of the crankcase ventilation system, wear of the cylinder-piston group, stuck piston rings or unpressurized valves.
If the valves are not pressurized, they need to be replaced. In other cases in order to prevent accumulation of exhaust gases over the crankcase and increased pressure, you can apply certain car care products.
To decarbonize stuck rings, introduce Anticarbon – anti-carbon engine cleaner
To eliminate the wear of the cylinder-piston group, add into the motor oil one of the following products: