Dilution of oil in gasoline engines (Audi 80 B3)

If an over-rich mixture gets into the cylinders, the engine rarely runs at full power or does not have time to warm up while driving (in urban conditions), and as a consequence - incomplete combustion of fuel. Soot, coal, other products, unburned fuel itself and wet condensate form acids and asphalt. Unburned fuel settles on the cold cylinder walls and flows into the engine crankcase, and it washes away the oil film from the pistons and cylinder walls. As a consequence, insufficient lubrication of the cylinder walls and dilution of the oil with deterioration of lubricating properties, depending on the amount of fuel in it.

If the dilution is severe, more frequent oil changes are required. During intensive operation, especially in winter (frequent cold starts - high gasoline content in oil), check the oil level more often.

(The original text of the material can be found on the website: AudiManual.ru)