Colorado_Mustang

10w-30 or 10w-40, depending on the condition of the engine. I typically run 10w-30 when I can.

snorulz

i know that synthetics in general will last longer but i had heard from several different places that royal purple should only be used for racing. It could be wrong but it could also be right. They do have a racing 11 formula, maybe that is the one that they were talking about.

my77stang

i run 10w40 in the summer and if your up north maybe 10w30 in the winter