For standard engine oil, go between 5,000 to 6,000 miles. Syn go 6,000 to 7,000. syn with a bypass I have gone up to 9,500 miles, that was my last oil change. this one I will be going 11,000 miles. I test the oil and I keep getting good results.
Transmission is 30,000 miles depending on how you change the fluid, then i will be shorter.
I think on the next EO I will pull a sample at 5k and see what that says and go from there. I don't know if it's comeing form Europe or not but I have a realy hard time buying in the h 3k oil change interval. Maybe it's becuew I'm usto Changeing oil anywhere between 15- 25k
So tonight I got the EO, tcase and trans done I haven't flushed it I just draind 8qts then I am going to drain again change the filters and fill back up again then run it for 1000miles pull another sample just out of intrest and compare it to the one I have just taken to see how much doing it this was cleans up.
But just as you get frustrated is nice to look up and find inspararion
i really like amsoil never used it in a diesel. mobil 1 is good i was wondering if u guys ever done royal purple all the way through the drivetrain and motor. i have done that oil change through four wheelers and bikes but not really a crew cab dually diesel lol.:taze:
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