YACT: too late for synthetic oil??

[Eli]

Originally posted by: Marshallj

Originally posted by: Eli
[
No... synthetic oils will remain fluid to a much lower temperature than conventional oils. Good synthetics are pourable to -60F.

They will, however, have the same viscosity at temperature - 30 weight.

Actually, that's what the first number in the oil weight is... the cold (winter) weight.

5w-30 synthetic should behave the same in the cold as 5w-30 conventional oil. They should both be 5 weight in the cold. If an oil was thinner, then it wouldn't be "5w-30", it would be "0w-30"

At the same temperature, yes. But conventional oil responds to temperature changes differently than synthetic.

Like I said, a good synthetic will be liquid to -60F.. most conventional oils are only good to around -25F.