Quote:
Originally Posted by Grenade
I'm a hot rod builder, in my opinion it is not the valve seals. The only time it makes any oil smoke is after it's warm and after an extended idle. And even then it isn't much. 120K is not what we consider "high miles"  We've got some with 270 on 'em. 
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If not the ccv valves (usually torn if bad) Then i am afraid you may be looking at valve guide seals. Mine went at 70.000 miles. extended idle hot the press the gas and out comes the smoke.
Out here in the peoples state of california, any smoke and you will fail the smog test then you must fix. Luckly I found a shop that did the seal replacement with the aga tool that allowed him to do the job without removing the cams or heads. not cheap around 1600.00. if i had the tool and the time probably just the seals and valve cover seals.
Tool
https://www.youtube.com/watch?v=YacOx2ydMbI
Could possibly be valve guides but most of the time the seals do it.
Get them from estuning, elring seals, the talk is they are made better to stop the leaks. Don't bother with the oem seals. Got 20000 miles and not a puff.
This is quite common on this engine. If you are a serious mechanic and this is needed you could buy the tool and sell it or rent it on ebay.