Now that's useful information! I was trying to understand the threads about oil getting into fuel from IP and conceptualize how it could be drawn into the lift pump, especially in the volume I'm experiencing. So, with clean fuel throughout the tank in my primary filter there likely isn't any oil making it's way from the IP through the lift pump into the fuel supply. Check that off. I've got the later single-line piston vacuum pump. Check that off. I've removed the breather tube and replaced with clamp-on filter and still used oil, so not breather ingestion. Check that off. There's absolutely no leakage or dripping from the engine or any other part of the car. Check that off. So that leaves the head gasket issue mentioned earlier which I'll test for this weekend when doing another compression test, and the possibility of bad oil rings, or a combination. Anything else we haven't visited or revisited?

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Joe Black
Get yellow fever at ACME!

Just the MB's: '82 300DT (stick), '81 240D, '80 300SD, '80 300D, '81 240D Manual