I read that the oil turns black quickly becuase the additives change color when they are heated. If the oil didn't have additives it would still be clear.

I'm looking at putting a frantz on my ol' 240D, but I don't like the drilling holes in things part of it all. Is it not possible to do this all in a reversible way? I guess not, duh, otherwise you guys would have done it.

Anyway, just looking for confirmation that TP is the way to go. Thanks for sharing the results.

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1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles