Should Jetta use 5w30 or 5w40?

[DeCamilla]

Jetta cars can use 5W30 engine oil. Here is the relevant content introduction: 1. Reason: Because Jetta cars use a naturally aspirated engine, and the original factory of Jetta cars also uses 5W30 oil. There are many different models of car engine oil, and different models represent different oil performances, so car owners need to choose carefully. 2. Low-temperature fluidity: The smaller the number before W, the better the low-temperature fluidity of the oil, which can be used in lower environmental temperatures. During cold starts, the oil provides better protection for the engine. The number after 5W-30 is the viscosity index, which refers to the oil's viscosity index being 30 at a working temperature of 100 degrees Celsius.