bfloyd4445
Silver Member
.Mobil 1 is as good as any other synthetic oil.
I've used it for years in cars but it isnt good for D's even the m1 turbo d oil as thats what i had in the tractor one time for about a week. My favorite is amsoil marine diesel oil. Its formulated for heavy duty use but it has one issue in extreme cold you need a block heater or your truck is hard to start. The reason in my opinion for this is that it is much thicker to compensate for engines that tend to water down the oil with fuel like PS 6.0's are supposed to do. I'm back to amsoils marine diesel in the old tractor she loves it.