What brand oil do you use?

Cummins12V98 wrote:

Hannibal wrote:
Until there is a measurable improvement in engine longevity or performance, John is right. Has anyone here ever lost an engine because they weren't using amsoil or any brand of synthetic oil? I use Mobil-1 because of the very slight chance of higher bearing temps while towing in Florida's summer heat. In reality, it's probably a waste of money and John is right.

I tow heavy, so I use the best oil/gearlube/filters and so on I can find. I keep my rigs usually 300K and in my opinion it is worth the extra money. If I were to trade rigs every few years I would run the cheapest of everything and not worry about it.

There are engines out there with a million+ miles on nothing but dino 15w-40. I am not telling you what to buy or how to spend your money, but your engine would likely get just as many miles on plain old rotella.