HouseCallAuto 3/30/2010Dried out valve seals and bad valve guides. If it is this, you will see a plume of blue tinted smoke immediately after startup cold that stops within a minute of running. A replacement cylinder head would solve this situation. Worn piston rings - burns oil all the time. If it is this, you will likely not fix it because of the cost. No PCV function - make sure the pcv valve has been replaced.