Shell Rotella T 15w-40 Motor Oil 1 Gallon
Product Review (submitted on July 16, 2012):
Rotella T...good stuff. I own a 3/4 ton 2004 Chevrolet with a duramax that I use to pull my camper, boats and equipment trailers; aside from the oil that came with the truck from the factory I have only used Rotella T 15W-40 in it and could not be happier. The truck has 272,XXX miles on it and I change the oil every 7,500 to 10,000 miles.