i have been trying to solve some smoking issue. i get puffs of white/gray smoke at start up, and always under heavy acceleration. it disappears at idle once the car is warmed up. also, the smoke is primarily visible at night, not very noticeable in the daytime (except by smell). the car runs very well, and gas mileage is good (around 22-24 mpg).
so first question, is this just normal and am i being obsessive about the smoke?

second question, still obsessing, how can i solve the issue?

the solutions that seem reasonable would be -
new valve seals - smoke kind of stinks like diesel or oil - i can't tell which - but i run B100, and even ran out of fuel the other day so am certain there is only B100 in there, and no i didnt run out of fuel on purpose. would b100 smell like diesel? that makes me suspect oil, so maybe valve seals to fault.

new injector nozzles - i have the old receipts for maintanece and have "R&R prechambers and injectors" at 203K, am at 259K now.

any thoughts on that?

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1979 300TD wagon (non-turbo)
266,000+