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Or simply check the Cummins recommended service intervals for it. They recommend 15,000 miles on an ISC (8.3L), nearly the same engine, but likely that one runs cleaner being a newer design, EFI, etc.... You could probably do 10,000 miles and call it good if you just wanted a simple no-math #...

99, you're really in a hurry to put something other than motor oil in your engine? What does it look like under the fill cap? I only did the ATF trick to silence lifters that had morning sickness, not on a regular basis. If your engine is not sludged, just change the oil.

I think it has a bunch of bad reviews, all over. So much to the point it is difficult to find in stock anymore? My experience is that it caused a small 4 cylinder of mine to suddenly have a lot of blow by, broken rings, etc....immediately after using it. Also, the can specifically states...

Synthetic is a waste unless extremely cold temps. I disagree with motor flush, bad historical experiences with it. Use any C-type API starburst rated 15W-40 and you're good. Delo is highly recommended on 2 stroke Detroits due to the shearing action of rings across ports, but for 4 stroke any...