I would get the owners manual out of the glove box and do some reading.
I prefer someone with real world experience to get real opinions from.
That's why this is a forum for Questions/Answers.
It's a difficult concept for some
Congrats on the new truck
Well, you're both wrong, and Stumpy is right: It's an MDS engine, and correct oil is critical.
I have an MDS '07 hemi so being a know-it-all I ignored the manual and put my normal diesel-spec 10-30 in it and the manual calls for 5-20.
Guess what?
MDS quit working and as a result mileage went down.
Switched back to 5-20 and the MDS came back and mileage went back to normal.
This is the one exception I have found in my automotive experience where the manual and Engineers were 110% right.
I believe there is another exception and that's ATF-4, but I'm not going to be the guina pig.
