Smoking gray-white when accelerating

With the engine warm (indicating greater than 80 degrees,) I can accelerate nicely in my 1984 300D TurboDiesel. At night with lights from other cars behind, and barely visible in the daytime, I can see smoke in the rear view mirror when I put my foot down on the accelerator. The engine starts first time, every time, even down to 10-15 degrees F with no block heater (indicating good compression.)

Is this normal? Do I have any adjustments or maintenance to perform to diminish the smoke. The folks behind me probably don't like to breathe such polution. I am presently trying to run a little Marvel Mystery Oil to mitigate the smoke and clean the fuel system.

Thanks,
Michael Smith