The Stovebolt Site Forums The Shop Area General Truck Talk Oil weight inMissouri

I run 15W40 Walmart diesel oil summers in my '51, at the winter change I do with Walmart 10W30.

For decades I used Delo 15W40 in our diesel trucks. Then I switched to Walmart Tech 15W40 (dino) oil a few years ago. In every oil comparison I've seen it ranks near the top in all categories that count. My Old Dodge Cummins diesel is at 300k and no engine problems. One nice benefit of the 15w40 is the higher viscosity quietens down the '51 3600.