What to Do If a Gasoline Car Accidentally Adds a Small Amount of Diesel?

1 Answers
StLydia
07/29/25 3:49pm
If a gasoline car is filled with diesel, to avoid engine damage, it is best to completely drain the fuel tank, clean it thoroughly, and then refill it with the appropriate oil for the vehicle. Here is some relevant information: 1. Research data shows that if the proportion of diesel added to gasoline does not exceed 5%, it generally does not cause significant damage to the engine. However, as the proportion of diesel increases, knocking and stalling can occur quickly, and in severe cases, it may lead to cylinder scoring. 2. The working conditions of gasoline engines differ from those of diesel engines. Gasoline has a lower ignition point, and gasoline cars typically ignite the air-fuel mixture via spark plugs, with lower cylinder pressure. Diesel engines, on the other hand, compress diesel fuel through high-pressure fuel pumps, injecting it into the cylinders via fuel injectors, resulting in higher cylinder pressure, rougher operation, and larger component clearances. Therefore, gasoline and diesel engines have different oil requirements. Gasoline engines require thinner oil with better fluidity, while diesel engines, which operate under higher pressure and harsher conditions, produce more carbon deposits and require thicker oil with stronger cleaning capabilities and larger clearances. Hence, gasoline cars should not use diesel engine oil.
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