Ponch1
Ponch
I have used 10w-40 since day 1. Dinosaur up to 5000 miles and synthetic ever since. At 15k now and minimal oil consumption. Even in Arizona summer heat. I don't intend to change.
I have a 2009 and the OM shows that 10w-40 isn't recommended for the temperatures we get here in the summer. May be the camheads are different.