I have a VW Golf mk4, 1.9 TDI from 2001 with 230.000+ km on board and for some time now I have blue smoke coming out of the exhaust. 

The problem aggravates when I'm stuck in traffic or when the engine is kept at low revs for a long time. After that, when I rev it up, tons of smoke come out, then it goes back to just little puffs of smoke, visible only if you get in the back of the car.

It eats about 750ml of oil every oil change cycle.

For now I have 2 suspicions: oil getting in the turbo and oil getting in the burning chamber, but both cost a lot and there is nocheap "let's see which is wrong" ...

What do you guys think, and how long do you think I can keep running like this ?

**FIXED IT:**

Managed to fix the problem eventually by replacing 2 injectors. Wasn't oil related in my case.

Also changed my oil brand and the oil consumption went down significantly.