I run full synthetic along with synthetic designed filters on all my engines except the Cummins
My minimum mileage for normal conditions is 7500 and longer if the computer is happy
The Cummins gets Dino and changed at 15k. I expect it it outlast me by many years. Generator is changed with Dino at 200 hours and could easily go more with no issues. My newer JD equipment manual hours is 500
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