BenzWorld Junior Member
Date registered: Sep 2006
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Very dark oil immediately after change ('74 240D)
Still messing with my dad's '74 240D project, destined to run on biodiesel from waste vegetable oil. Currently still on pump dino-diesel.
The oil was very black when we got the car, so I changed it and my dad has driven it some since then. I checked it again last week, and it was black again. Just working some of the old crud out from the previous owner, right?
I changed the oil again, backed the car off the ramps and had lunch. When I checked the oil level, it was very dark already! I suspect the engine has quite a bit of blowby, but it shouldn't be this dark after just letting the engine run for 2 minutes, should it?
Any guesses as to what's causing this? Is it picking up sludge from the oil pan or front mounted oil cooler? I know engine flushes can pretty much kill an engine, but is there some safe type of flush or cleaning agent I can run? Thanks.