What is the difference between gasoline engine oil and diesel engine oil?
2 Answers
Gasoline engine oil and diesel engine oil differ in the following aspects: 1. Different materials: The main bearing bush and connecting rod bearing bush of gasoline engines can be made of softer and more corrosion-resistant Babbitt alloy; diesel engines must use high-performance materials such as lead bronze or lead alloy for their bearing bushes. 2. Different fuels: Diesel engines are engines that burn diesel to obtain energy release; gasoline engines are internal combustion engines that use gasoline as fuel and rely on electric spark ignition. 3. Different combustion methods: In gasoline engines, the mixed gas ignites and burns instantly, releasing energy; in diesel engines, after the fuel is injected, combustion takes a certain amount of time, allowing heat to be more effectively converted into kinetic energy. 4.
When I first started with car maintenance, I discovered that the fundamental difference between gasoline engine oil and diesel engine oil lies in engine design and usage requirements. Gasoline engine oil is specifically designed for gasoline engines, generally with lower viscosity because gasoline engines burn cleaner and operate at relatively moderate temperatures, focusing on protecting the spark plug system and reducing deposit formation. On the other hand, diesel engine oil has higher viscosity and contains additional detergents and soot control additives. This is because diesel engines' compression ignition generates higher pressure and more contaminants, requiring the oil to withstand high pressure and resist wear to protect cylinders and turbocharged components. I once used the wrong type, resulting in loud engine noise and a sharp increase in fuel consumption, which made me realize that mixing them can damage internal parts. Regularly checking the oil's API labels, such as the S series for gasoline engines and the C series for diesel engines, is crucial. Proper maintenance can extend engine life and save money.
