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If you're running synthetic and aren't leaking oil, no need to change. I'd run amsoil if my all my seals didn't leak so bad. In all honesty, the Cummins will like just about any motor oil, rotella, valvoline, amsoil. I ran rotella t6 for a couple hundred miles and I think it quieted my motor down a smidge, but the oil pan gasket and front crank seal were leaking like a sieve so I switched back to valvoline premium blue. Don't need to overthink it too hard.

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