my 240D has 711,500mi on it and it has considerable blowby. when i put the cap on it loosely it dances around enough where it falls off the valve cover. it does also smoke somewhat, and oil consumption is about 2 quarts every oilchange.(i add it during that time). the car drives great and i have no complaints.

my 300D is much better. it is not my beater first of all and it has 182,000mi on it. the blowby is almost not mearsureable. the cap does not move at all when i loosen it, and it does not smoke or use oil.

what you described as having blowby is not much at all in my book, and i think your car is just fine. enjoy it.

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Grey '91 350SDL 214k Dad's car
Beige '81 240D 4 Speed 254k SOLD
Blue '82 300D 225k SOLD
White '95 E300D 46k SOLD
Blue '87 190D 2.5 Turbo 315k SOLD
Brown '80 240D 4 Speed 716k SOLD
Beige '80 300D N/A 119k SOLD
Blue '85 300D Model 186k T-Boned