my car recently started to show signs of smoke at morning starts. it's not a common condensation white smoke, it is light bluish colour. it smokes until gets fully warmed up. after it no smoke during whole day, even if it gets cold
oil consumption also went pretty high..

the engine is built with wiseco pistons and pretty loose clearances I think, but haven't had this problem before. valve stem seals were installed GSC Viton ones

any ideas ? seals went bad or something with oil rings ?

 

Oil seals on the turbo caused blueish smoke on my old speed6 k04. I would suspect that as the culprit.

 

The other possibility is valve stem seals.

 

I second that. My car was doing the same exact thing, so when my GSC s3 cams were installed I had new valve stem seals and problem solved.

 

which are more or less quality valve stem seals and where can I get them ?
these ones I've mentioned in first post were installed ~15K miles ago. I doubt good valve stem seals have such short lifetime

 

When I had my cams installed, there was a conflict between the dual valve springs, specifically the inner spring and the valve stem seals. The inner spring was actually dislodging the valve stem seal and lifting it up, letting oil into the cylinder.

 

u answered yourself, engine was built with loose tolerances so oil would escape until it has warmed and oil has thickened

 

^^
after that I also wrote this

I meant not before the rebuild. it started recently

 

please suggest me which valve stem seals to buy, and where

thanks

 

I remember seeing threads like this before where there was interference with valve springs and discussions about what seals to use. So, if that indeed is your problem, information is here.

 

I doubt it's turbo seals, he said during idle. Lost likely valve seals

 

is there any difference in quality in GSC, supertech or ferrea valve stem seals ?

they all say Viton valve stem seals, and pictured all the same. price differs though

 

For reference, I was running SuperTech valve seals and SuperTech dual valve springs - I experienced interference in 2 sets. Finally switched back to OEM valve seals and just running the outer valve spring.

 

i had never noticed the smoke color, but i was getting a big puff of smoke pulling away from a stop, and instead of smelling like ethanol, the exhaust reeked to burned oil all the time. compression test was good. english pulled the valve cover and found that four of the exhaust valve seals had popped up but none of the intake. replaced all the exhaust valve seals - smoke is gone and ethanol smell is back.

 

Agree!

Turbo seal smoke usually shows after warm up. Oil pools and burns off when the exhaust is hot. Just had my 944 turbo rebuilt bc of this. Guessing valve stem seals too.