- Joined
- Feb 28, 2022
- Messages
- 3
My 2017 6.7 PSD just turned 100k and I decided to get an oil analysis at speediagnostix. Oil was just under the 5k mile mark when changed which has been the normal interval since new. I also have a bypass filter on the truck, but have never tried to go extended change intervals. Truck fill is 16 qts and did not have any top off oil. I might try to go to 7500 and test again this time.