- May 25, 2005
- west coast
I was thinking of putting a 50/50 (3 quarts of each) mix of Castrol 5w20 Syntec and Castrol GC (green) into my 3.0L Duratec which calls for 5w20, any opinions. I wanted a bit thicker mix for the summer months as I'll be up in the bush a lot with it. I have a bunch of oil sitting around and wanted to get rid of the stray 3 quarts of GC.