Rawze 871 rebuild on YouTube

[Rawze]

The oil staying clean for about 10k+ miles or more at a time in an ISX that is well cared for is not that unusual actually, once the right conditions are met.
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== No, it is not the bypass filter keeping it that clean. Matter of fact, I had removed that filter a year or 2 prior.

== One clue ... There is no more soot is going into the intake + very good custom programming that I did myself, set up just for my application and driving style.

== I am also a Hyper-miler that barely presses the fuel pedal everywhere I go, I only drive 60~ish mph, + never abuses the engine.