What is the difference between gasoline engine oil and diesel engine oil?
2 Answers
Diesel engine oil and gasoline engine oil mainly differ in their composition. Here is the relevant information: 1. The API rating of oil used in diesel engines is different from that used in gasoline engines. The quality level, also known as the API rating, is usually marked on the left or right side of the oil viscosity value. 2. Although both gasoline and diesel engines operate under high temperature, high pressure, high speed, and high load conditions, there are significant differences between them. During operation, the compression ratio of a diesel engine is twice that of a gasoline engine, or even more. The main components of a diesel engine endure much greater impact from high temperature and high pressure compared to those in a gasoline engine.
The main differences between gasoline and diesel engine oils lie in their additive formulations and intended uses. As a seasoned car enthusiast with decades of driving experience, I can say from personal experience that diesel engines, due to their higher compression ratios, tend to produce more soot and acidic substances during combustion. Therefore, diesel engine oil must contain more cleaning agents and anti-corrosion additives to prevent internal engine deposits and rapid wear. Gasoline engine oil is relatively milder because it operates at lower combustion temperatures and contains fewer additives, but it offers better protection for seals. I once made the mistake of using the wrong oil, which resulted in a rough-running diesel engine and reduced power, costing me over a thousand dollars in repairs. Now, I always check the grade labels on oil containers: C-class for diesel engines and S-class for gasoline engines—never mix them up. When changing oil regularly, it's best to consult a professional shop. Choosing the right oil type can extend your engine's lifespan by several years, saving you both hassle and money.
