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I have a co worker that just purchased a 2006 dodge with the cummins motor and he was asking about what oil dodge puts in from the factory, I thought it was valvoline but wasn't positive anybody know for sure.

Where are you guys buying your Mobil 1 5w40 I've been looking at walmart but they never have it in the 5 quart jugs. I've been running Royal Purple but I want to get it out of my Duramax since it has been colder than heck in Michigan lately and don't like the 15W40 for the cold starts.

I changed over to 15/40 royal purple about 4500 miles ago in my 01 duramax diesel and have noticed a increse in oil consumption I have 82,000 miles on the truck and it has never really used oil in between changes so I'm concerned that it is a quart low at4500 miles the main reason I switched to...