Originally Posted By: DeafBrad
Originally Posted By: Linctex
Originally Posted By: DeafBrad
How long to you leave the oil in the engine before draining it?
Some people say "indefinitely"
It really depends on whn you "catch" the filter flow before it stops up completely, and the TAN (total acid number) when you get an oil analysis (you usually have to ask for TBN/TAN).
I know a few folks who go every 10,000 - then change the roll and add 1 qt synthetic.
Thanks for the information. My plan is to change out the filter every 5,000 miles and top up the oil. My plan is to do a drain between 20,000 and 25,000 miles. That means my oil is left in for 8 oil changes in length.
With a filter change every 5000 miles and your regular full flow filter change you might not need to ever change the oil. I've had my Cummins( 15 quart sump) on this schedule now for 40,000 miles, no oil change yet, just a toilet paper roll every 5000 miles and a full flow every 25000 and the lab says keep using. I also started my V10 gas (6 quart sump) on the same schedule with an oil analysis every 12 months. Keep us posted on your results.