Quote:
Originally Posted by Gunkk
This is not always true, and I suspect is the assumption made by the OP's shop.
Partularly in the case of Mobil1 dexos oils for our Camaros, the 5W-30 actually has both a lower cold and lower hot viscosity than the 0W-40 Forumla ESP, as seen in the above links.
So the 5w30 is the better cold oil.
|
This article is to the point but explains why 5w is better in hotter environments
https://www.mrtonneau.com/0w-40-vs-5w-30/