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Old 12-24-2021, 10:32 AM   #25 (permalink)
EcoModding Lurker
Join Date: Dec 2014
Location: Alberta
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Merc - '97 Mercedes V230 TD Fashion
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Originally Posted by Piotrsko View Post
If you don't notice your oil turning black from unburned fuel, you're not looking at the engine oil
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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