Question 1

What is the difference between 5W-30 and 0W-20?

Accepted Answer

The number before W represents low-temperature fluidity (0W is more cold-resistant than 5W). The number after represents high-temperature viscosity (30 is thicker than 20). Japanese cars often recommend 0W-20; German cars often recommend 5W-30 or 5W-40.

Question 2

What happens if I overfill engine oil?

Accepted Answer

Too much oil increases crankshaft resistance and fuel consumption, and may damage seals in severe cases. Keep the oil level between the upper and lower marks on the dipstick.

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