Posts Tagged: thicker oil

Thicker oil for an older engine

Should you use thicker oil in an older engine? Lots of forum users ask if they should use a thicker oil in an older engine. The theory is that an older engine has more wear, so you’d want a thicker oil to fill in the wider clearances. But that theory is false. Engine designers specify a certain oil viscosity for a reason and it’s based on bearing clearances, engine cooling needs, oil pump capacity, fuel pump needs, and valve timing mechanisms. What happens when you use a thicker oil Let’s … Read More