Does your car have any faults, even ones that are not lighting up on the dash?
When was the last time you gave it a good italian tune up?
Check the air filter too, if that is very old and clogged that in turn can cause smoke from unburnt fuel.
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2016 435xd GC, MTC intercooler, centre and back box deletes, GKR stage 2 remap, methanol injection, H&R lowering springs. To do: wash it.
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