Identifing the smoke color tells you where it is coming from. Black smoke comes from fuel, so it is running rich or not fully igniting the mixture. White smoke comes from oil and often happens under very heavy engine load. On acceleration this could be the piston rings allowing blow-by, on deceleration this could be the valve seals leaking. Blueish smoke is often coolant, indicating a head gasket leak.
You didn't state iof this happens during a moving gear change, or if it has happened since you physically changed some of the gears in the car. On a TDi, I would follow the factory recommendations for all engine lubricants and additives.
SOURCE: By changing gears while driving I've got black got
start wih #1,try using a can of redexe/wynns injector cleaner(1 can to 1/2 tank diesel)works well...#2 use 10/40 semi synthetic(best you can afford).i prefer not to use any other fuel additives(other than redexe)as VW group products are susceptical to "clogging"(dirty/high sulphur fuel dont help).i use a can of red every 25k,tailpipe dark grey......
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