My 1995 940 tubo with 90,000 miles is blowing oil and smoke. I changed the PCV box hoping that would help but the smoke is just as bad. I see oil coming out after turbo where it connects to exhaust manifold and exhust down pipe.

There also is an oil leak at the front corner of the head gasket.

The smoke started about thee months ago and got progressivly worse.

Can anyone tell me what the next diagnostic test would be?

 

Well, the seals in the turbo do go bad and will cause oil burning. My question would first be, what viscosity oil are you using?

 

Chances are you need a turbo rebuild... Even the thinnest oil shouldn't escape through those seals...

 

I agree with the turbo too. Centre sections are fairly cheap these days, you should not see any oil leaking from the turbo anywhere. Oil doing this is a sign of some sort of turbo related failure, no matter where it is coming from.

Regards, Andrew.