Hi Can anyone help diagnose what's causing this?

My 760 Turbo (B230ET) started chucking out blue smoke from the exhaust some time ago, this was solved by cleaning out the breather hose and the breather located in the air-box, but I'm now finding that the breather has been blocking up on a regular basis (about every 700 miles) and the blue smoke returns. Any suggestions as to what could be causing this? Apart from this the car runs fine - no loss of power or turbo boost.

Thanks

Flush out the engine, and refill with new oil and filter. If this does not clear it, check for excessive back pressure at the filler cap. It may be that your piston rings are worn.

Further information: - I don't believe that the piston rings are worn, so I thought the same as niloc and flushed engine, erplaced filter and renewed oil. Rather than clear the problem, this made the problem worse. Within 50 miles the breather had blocked and the blue smoke returned -- short term solution (I was 40 miles from home and didn't want to drive back pouring out blue smoke) - I pulled off the breather hose - end of problem. However, this I consider a linp-home-fix. My Turbo has been overheating lately this problem I found to be a faulty water hose which I fixed only today - could this have been causing the problem? - if the turbo is overheating - will it burn oil & from where? - Although engines are not a problem, I'm relatively new to turbos so help would be appreciated

ok...

1. could be rings, do a compression test/ leak down test

2. could be a turbo issue, my turbo failed by chucking oil out of the inlet side..net result oil in th turbo tubes...into the trottle body which under boost forces oil back UP the mini tube to the 'flame trap'...

3. do you have flame trap fitted..if so you shouldnt, if its this thats blocking remove it

4. If your turbo is overheating you have a problem.

5. i would gues you have a failing turbo, remove ALL the large diamet er air pipes and clean THOUROUGHLY and drain and clean the IC, then do some miles and se what oil is about in them, anything more than a misting is a problem...also check your turbo free play, pretty much if you can feel any its toast!

6. When my turbo was going i found that the BIG pipe from the breather to the inlet was badly coaked and i had to tdo SERIOUS cleaning to get it to flow well i.e. platic cloated wire and solvent and a good rodding..

7. You have replaced the breather box havent you? if not DO IT NOW they can block and do all sorts, u can clean but not worth it...just replace (see faq!) easy job and worth it..

8. If you have that much presure I would suggest you sort as a matter of urgency, best case is you loose a cam seal, but you can loose the rear seal which is big PITA or $$$...

I've put on a nice shiny breather box today - and presto - no more smoke. The box was completely blocked.

Thanks for the help.

way to go...just hope it hasnt cooked your seals....