Originally Posted By: daman
Originally Posted By: Steve S
The oil won't make a difference if you shut the engine off when the turbo is hot.
dmaxs have auto shut down,turbo needs to cool before computer shuts engine off.
Unless they have some new feature I'm not aware of, this isn't ture. I know FOR SURE my Dmax doesn't have it. I don't think any of them do. The OP stated his truck was pure stock, so I doubt he has that either.
Further, central OH isn't any different than central IN, where I'm at, weather wise. There is no "need" for a 5w-40 synthetic in this area. It's nice to have as an option, but it's not needed. GM recommneds 15w-40 dino oil down to zero deg F. They also approve 10w-30 at those temps. I've run both, and I must admit that the 10w-30 starts easier and builds pressure a bit quicker. In this area, I don't see a "need" for 5w-40 synthetic. Nothing wrong with using it if you choose, but don't try to convince yourself or others that it's needed. Dino 10w-30 is very well suited to this area, and year round use; I've got a UOA to prove it!