Join Date: Dec 2010
Feedback Score: 0 reviews
It gets down to single digits around here, so the 5W-40 is probably a good choice. The local dealer recommends 15W-40, so that's one against them. They also claim that due to altitude, dust and other conditions (Reno, NV) that we are under "Special Operating Conditions" at all times here.
I have had nothing but good results withe Mobil 1 in all of my gas engines. I think I will keep using it in my "new" (used) 08 F350, 34,000 miles. I will probably just change it at the 5,000 mile interval to keep Ford and the dealer happy, just in case.
Thanks for your input.