When my engine was ruined by a disintegrating turbo, I had a reliable shop replace the block. However, it seems that the replacement block, that they said was off an early 300SD, did not have a port to return the oil from the air filter separator.

The drain port of the filter housing is plugged. I have a removable port on the top of the separator. Each time I do an oil change (about once/year or every 6000km) I use the MightyVac to suck out any collected oil. There is never that much there. I presume some gets sucked out into the intake.

Seems to work and not much different from the cars without an oil separator.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5