The torque convertor is inside the gearbox and uses the same oil - when you do an oil change half of the oil is stuck in the TC after the oil is dumped.
Exactly the same symtoms mate, although mine is quite rare... for now!
I'm not sure of the exact mechanism other than it's oil pressure that locks it up (i was after trying to add an overdrive button but the ZF box can't do this), whether the pilot circuit is blocking/leaking or if the actual...
I know what you're on about mate... don't think its supposed to do it - i put it down to a 110k gearbox!
On the odd occasion when it happens to me (tends to be when it 'rolls' above 52mph rather than 'giving it some'!) i find selecting 3 then back to d cures it.
I'd be interested to know if...
Don't bother looking for it mate... your 200tdi doesn't give a shi'ite what ration your TB is in!
If it's just at low revs, it does sound like it could be a vacuum issue. What does the pedal feel like when you have no brakes?
I am one meself!
Brush on and wipe over with a rag... have no drive so can only do a small area over cardboard at a time & there's enough oil spots on the road in front of my house already thanks... ;)