What are the differences between gasoline engine oil and diesel engine oil?

1 Answers
DelKarter
07/24/25 10:41pm
There are several differences between gasoline engine oil and diesel engine oil: 1. Different fuel economy grades. According to the ACEA European Lubricant Classification Standard, the latest classification consists of three series: A/B series for gasoline and light-duty diesel engine oils; C series for catalyst-compatible engine oils; and E series for heavy-duty diesel engine oils. 2. The compression ratio of diesel engines is more than twice that of gasoline engines, and their main components endure much higher temperatures, pressures, and impacts than gasoline engines, leading to differences in the materials used for some parts. 3. Diesel fuel contains more sulfur than gasoline. This harmful substance forms sulfuric or sulfurous acid during combustion, which, along with high-temperature and high-pressure exhaust gases, enters the oil pan, accelerating oil oxidation and degradation. Therefore, diesel engine oil formulations require more antioxidant additives and stronger alkaline properties. 4. Different oil viscosities. Diesel engines operate under harsher conditions and require stronger oil film strength (on friction surfaces), so diesel engine oil has higher viscosity to ensure proper engine lubrication.
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