Question: what is the difference between engine oil?
Answer: So 5W-30 viscosity engine oil thickens less in the cold than a 10W-30, but more than a 0W-30. An engine in a colder climate, where motor oil tends to thicken because of lower temperatures, would benefit from 0W or 5W viscosity. ... For example, 10W-30 oil will thin out at higher temperatures faster than 10W-40 will.