Since Cummins is not an oil manufacturer, I use the appropriate weight oil. Gas and LP seem to use 10W30 and diesel 15W40. I have been doing my own oil changes since my first car 40 years ago and always use whatever synthetic that is on sale. Haven't lost an engine yet.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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