Quote:
Originally Posted by clarknova
I own some IDI engines and a common-rail. All of them have black oil, despite a disabled EGR and oil catch can. AMSoil sells a bypass oil filter that claims to remove soot and it's on my wish list.
We have a large mechanically-injected Cummins generator at work and the oil always looks pristine. I'm not sure what the secret is. Maybe because it never runs above 16% load except during semi-annual maintenance.
I drove a 2015 school bus with a Cummins 6.7 for two years and I never once saw the regen light turn on. Probably because I drove a rural route. I don't recall if the oil was black in that one.
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The oil in diesels turns black quickly regardless of EGR as the raw particle emissions are pretty high and contaminate the oil.
Interestingly the opposite can be observed in CNG/LPG vehicles where the oil takes a long time to darken.