Here is my continuing issue: As you all know, I have a nice 1983 240D with manual transmission, A/C is cold, everything works. Starts/stops fine, brakes fine. 144K miles, get 27 mpg. Runs fine with one big exception. Horrible smoking problem using 1 qt of oil every 450 miles. James Bond smoke screen on the onramps!! Problem could be bad valves or bad rings. Options.

1. Have a valve job done on it. (seems to smoke too much for this to be the problem)
2. Have a complete rebuild done on it.
3. Buy a rebuilt 300 Turbo engine from Metric Motors or another vendor and have it dropped in the car, the old engine goes away.
4. Buy a used 300 Turbo engine, but how can a person tell if the used engine is good?

I don't believe the vacuum diaphram is bad and sucking oil into the engine. The vacuum line goes up to the master cylinder, where does it get to the intake manifold? My 76 had a white tube running from the VP to the intake, I don't seem to have that on this 83.

I like the car but it doesn't seem to be cooperating with me to have a mutually beneficial relationship!

What do you think?