I've forgotten if it smoked on accel, or decel but in either case I've done the soaking the pistons in MMO for a few days more than once and it really did help reduce blow by and crank case pressures, lowering the leaking significantly .

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better

If you are aware of anyone claiming no oil use at high speeds with a 240d. Try using whatever oil they are using. Their multigrade may just be holding better viscosity than whatever you are using. When hot.

Manuals on most of our air cooled lawn tractors specify 10-30 for example. I use straight 30 or 40 weight oil. Some of our engines are really old now and still run as new. We are talking larger lawns. Plus 40 years of use.

You want to reduce oil consumption on a car using 10-30 to about half. Use straight 30 oil. In most cases it will reduce consumption that much.

Many old timers think using 10-30 in an older diesel engine will reduce the lifespan of that engine over time.

I failed to mention in my earlier post that I also changed oil brands, going from rotella to mobil one. My 83 240 uses very little oil on the interstate running 15-40 rotella.
I would not have ever used 10-30 in that car intentionally during the summer. I had bought it for a winter run up north. I have found switching to 10-30 in winter helps cold starts and mileage, but we don't get enough winter in TN to make it worth the switch.

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1985 300 TD 448K
1984 300 TD 278K

1983 240D euro 240k
1994 f-250 idi turbo 330K
1986 f-350 IDI
1987 F-350 IDI

1985 JD 1050 4wd
1965 IH 3660

I have the same oil issue running highway speeds for extended periods. On a 600 mile trip I probably burn about a quart. Nothing around town. I have an aftermarket provent catch can installed which catches quite a bit of oil -but again, only on 70mph+ extended trips.
As someone mentioned earlier, I think those are just the breaks for a 616.

Ditto for everything BillGrissom mentioned. I take it Envirosafe is a similar formulation to Duracool (which my system is running)? What a difference it makes over r134...

Good to know about the throwout bearing compatibility.

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1981 240D 4sp manual. Ivory White.