How much smoke is normal? '76 240D

[abracadabra]

So my other ride is a '76 W115 240D that I've had for a long time now, it truly converted me to the Benz way of life forever!

My main concern with this car has always been its tendancy to smoke. It has always smoked, and it hasn't gotten better or worse in the last 6 years. Actually, it gets a little smokier when I run B99, which is a tradeoff since the engine runs smoother so I compromise with a blend.

Now, this car has been around the block but I'm certain (and my mechanic mentioned this too some years back) that this car had an engine rebuild at some point. But I have no verification for this, only the fact that it has great compression, starts on the coldest mornings, and literally has never let me down, ever! This car has never stalled even except for twice when I ran out of gas!

Oil consumption seems fairly normal, I never keep meticulous records but when I think about it I'm sure I never go through more than 1-2 quarts per 3000k.

The smoke isn't horrible, a greyish smoke, but its enough that I don't feel great about driving it!

Oh, DEQ here was a breeze, the smoke wasn't a problem.

My mechanics mentioned that the older diesel Benz's tend to be smokier , that the fuel delivery system was changed in the mid 70's...........BUT......
I just bought a '72 220D and it doesn't smoke hardly at all, mostly just at startup. This has a fairly fresh engine but still.....

So, fell W115 240D owners, how much do you smoke? Should I feel bad about it? Anything to try? I did try some of the Lucas oil additive for awhile but this didn't seem to help much.......................

thanks!

mark in Portland