What are the methods to distinguish between diesel engine oil and gasoline engine oil?
1 Answers
Although gasoline and diesel engines both operate under high temperature, high pressure, high speed, and high load conditions, there are still significant differences between them. The differences between diesel engine oil and gasoline engine oil are as follows: 1. Different fuel economy grades. According to the ACEA European Lubricant Classification Standard, the latest 2007 version classifies them into three series. They are: A/B series: oils for gasoline and light-duty diesel engines; C series: oils suitable for catalyst-equipped engines; E series: oils for heavy-duty diesel engines. 2. The compression ratio of a diesel engine is twice that of a gasoline engine, and its main components are subjected to higher temperature, pressure, and impact than those in a gasoline engine. Therefore, the materials used for some components are different. 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 the oxidation and degradation of the oil. Hence, diesel engine oil formulations require more antioxidants and additives that make the oil more alkaline.