What is the Difference Between 80w90 and 75w90?
1 Answers
The differences between 80w90 and 75w90 mainly lie in two aspects. Different Labeling: The 80 type has better low-temperature fluidity than the 75 type. The 40 type has higher viscosity and thicker oil film, making 5W40 suitable for German engines or older vehicles with larger internal clearances. 5W30 is more suitable for domestic, Japanese, American, and Korean vehicles, as it has lower viscosity and thinner oil film, reducing engine resistance during operation. Different Grades: The viscosity grade of gear oil is determined by its kinematic viscosity at 100°C and the maximum operating temperature when its apparent viscosity is 150,000 mPa.s. It is divided into seven viscosity grades: 75W, 75W/90, 80W/90, 85W/90, 90, 85W/140, and 140.