This is my first time posting here.
2007 GMC 2500HD 6.0L
Amsoil ASL 5w-30, Ea50 oil filter and Amsoil Eaa123 air filter installed
3/27/09 at 19627 miles
8/09/09 date of sample 27,812 miles on truck at time of sampling,
8,185 miles on sample
I drive primarily mostly highway miles during the...