I have been using Shell Rotella for years, but I'm thinking about a switch to:
Conoco Phillips Guardol ECT-TI.
I can get it cheaper, and locally.
Unlike rotella, it's only avail in 15w-40.
Anyone using this?
It would be for the '06 5. 9 HPCR and the '96 5. 9 12v.
Thank you,
KRS