Does the Rotella 10W30 have the same additives as the 15W40? I thought the additives we need were only in the diesel grades. A lot of guys run 1/2 can of EOS at every oil change on the flat tappet motors. At least that is what they tell me anyhow. Sam
The (API?) grades JohnZ listed will appear on the oil jug as he listed them, if the additive package IS the same- JohnZ's quote from above:
"I'd recommend one of the 15W40 CI-4 or CJ-4 diesel oils (Shell Rotella, Mobil Delvac, Chevron Delo, etc.)."
So if you choose another viscosity, look for those listed qualifications which indicate the appropriate additiives are present.