What are the differences between foreign and domestic engine oils?

[LondynMarie]

Here are the differences between imported and domestic engine oils: Foreign engine oils: Imported engine oils generally use relatively better raw materials. The technology of engine oils is essentially determined by two components: one is called base oil, and the other is additives. Imported brands primarily source their base oils from South Korea, Singapore, Taiwan, and Japan, which undergo fine processing in refineries. The additives also come from four major additive companies. Domestic engine oils: Domestic engine oils also use imported raw materials, which are then processed and produced domestically. Most of the base oils independently produced by domestic refineries have viscosity indices that are too low, with insufficient production of high-viscosity oils, and the quality does not meet the requirements for blending. The situation with additive raw materials is similar.