If an over-rich mixture enters the cylinders, the engine rarely runs at full power or does not have time to warm up while driving (in urban environments), and as a result - 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 crankcase, and it washes away the oil film from the pistons and cylinder walls. As a result, insufficient lubrication of the cylinder walls and dilution of the oil with a deterioration in lubricating properties, depending on the amount of fuel in it.
Severe thinning requires more frequent oil changes. For intensive use, especially in winter (frequent cold starts - high gasoline content in oil), check the oil level more often.
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