I have an A4 2.5 v6 tdi quattro which is smoking every now and again (quite alot really) and it sounds like the oil breather is blocked from what i have read on this post and from a test revealing high compression in the crank case. Has anybody replaced this part on their car and how di they go about it? Did you have to remove the turbo/injection pipes? If so with removing either of these are there anything i should be aware of before doing so such as gaskets/tools i may need and if i need to bleed the fuel system or depressurise it first? would be very grateful for any advice as i hope to do the job tomorrow.