Sorry to do this but.. I've used the search button and something is bothering me this year as I'm ready to change oil on my 03
I've always run Amsoil Signature Series 10w-30 w/ Ford racing FL-820
How many of you guys run 5w-30 vs 10w-30?
I've always run Amsoil Signature Series 10w-30 w/ Ford racing FL-820
How many of you guys run 5w-30 vs 10w-30?