am trying to figure out source of excessive white smoke out the tailpipe from new 91 300D. Here are some facts:

254K

no external oil leaks anywhere I can see.

lots of sludge/wet oil everywhere on intake plumbing, now cleaned up best I could do.

pulled rubber boot to inspect turbo impeller, no play in either direction, but while running & crossover pipe removed, saw it stop a few times @ idle, would start spinning @ higher rpms.
this is a little suspect to me.

also, when I revved it up & placed my hand over EGR pipe, I did not feel more than a slight pressure increase.

same white smoke comes out of breather as well.

smoke smells neither of fuel nor coolant, & hangs in the air quite a while.

it is entirely possible that this car experienced overheating prior to my brief ownership as crank pulley/balancer were not in place @ time of purchase.

smoking aside, the motor runs great above 1500 rpm, idle is smooth, starts right up, but misses from time to time off idle to 1500.
missing seems to be improving each time I run it.

fresh synthetic oil, fuel filters, injector nozzles, return lines, IP lines

I have spent hours researching the archives & have come up with turbo seals, head gasket, valve stem seals or some combination of the three as being the likely culprits.

any gurus want to weigh in on this?

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1991 300D