Quote:
Originally Posted by Hersbird
I'm debating using something besides 15W/40 in my Cummins. Does anybody here have any experience? I know I need to find something rated to handle the soot and my motor has 273K on it. Would that make it potentially worse or better to use a thinner oil? Some people use a 5w/40 synthetic but that seems like a big spread in viscosity to me.
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I've used 5W40 and 0W40 with no issues in gasoline engines. From what I've gathered, the Rotella T 5W40 is all Group III, so it doesn't need as many VIIs as a dino version would. I would be surprised if 0W40 didn't involve some Group IV/V to reliably get its viscosity spread.