Can Gasoline and Diesel Be Mixed for Use?

1 Answers
MacDonovan
07/30/25 12:05am
Gasoline engine oil and diesel engine oil cannot be mixed. Here are the detailed explanations: 1. Because the working conditions of gasoline engines are different from those of diesel engines. 2. Gasoline has a low ignition point, and gasoline vehicles typically ignite the air-fuel mixture through spark plugs, with lower cylinder pressure; whereas diesel vehicles compress diesel fuel through a fuel injection pump to produce high-pressure diesel, which is then injected into the cylinder via the fuel injector, resulting in higher cylinder pressure, rougher operation, and larger component clearances. 3. The requirements for engine oil differ between gasoline and diesel vehicles. Gasoline engine oil needs to be thinner with better fluidity; diesel engine oil operates under higher pressure and harsher conditions, producing more carbon deposits, thus requiring stronger cleaning capabilities, larger clearances, and thicker oil. Therefore, diesel engine oil should not be used in gasoline vehicles.
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