Maze

Thanks greydog 

I’ll double check all with mechanic. 
I’m sure he would have topped up the transmission 

Thanks for the reply GREYDOG

its covered 110k, it’s got good prompt service history, it’s normally driven locally or parked up .. so that why I guessed could the CAT be blocked ?
the burning smell is of oil definitely  , as far as the trusted mechanic has advised there are no leaks around the engine that could be dripping in the exhaust/manifold  area, he did find the gearbox drain plug was a little loose because Yes the recall on the egr is done (bmw) they did a health check and said there was oil sitting in the engine tray. 
 

im not entirely sure if any of the components you’ve mentioned have been checked. 
 

or the sensors for the drive train you’ve mentioned . 
 

maze 

Hi guys, so got a 640d 

first issue is : in the last 3 months I’ve had a bad oil burning smell enter through the vents and a load of burning oil smoke coming from the engine ? Has been checked for oil leaks nothing has been found .. could it be the cat be blocked ? 
 

second issue: drive train, randomly pops up