black oil is unavoidable in a diesel.

the onlly diesel i have bought new is my 03 dodge. i have 37000 miles on it and the oil is not yet black but it is getting darker all the time.

all my mercedes diesels run the oil black. if newly rebuilt they are clean for a while but in 10000 or so they are black again.

on my 123s the center vents run with the ac, not fresh air all the time.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.