cummins2014 wrote:
I am a low mileage guy oil change ,once a year now, along with fuel filters etc . As far as how far someone can go with any good quality oil ,it would probably match whatever AMZ/OIL will go .
I used to have a bypass oil filter on my 99, 7.3 and would go about 35000 miles between oil changes. The reason I did this was I used my truck to drive to work as well as pulling my 5th wheel and trailer before that. I would put approximately 30000 miles a year on it, so with the filter and oil sample analyzing to establish my new milage I could run before the oil needed changing (it ended up being much higher than 35K) it saved me about 800 a year in oil changes. The cool thing is at 35K the oil still looked clean. I switched to royal purple full synthetic. Now in my 6.7 it tells me when to change the oil, anywhere between 10 and 14K km depending on what the computer sees the truck doing, so I just go by that and run Rotella T6. I amso have a beater car for going to work now so the oil changes are not anywhere near as frequent.
Amsoil has been pushing the same claims for over 30 years and I have yet to see why they are better than any other.