my sister has a 2002 vw jetta with a 2.0l 4. it consumes a lot of oil, which is supposedly due to the piston rings being installed wrong. my question is, if the car consumes a lot of oil, would this affect the life of the oil? if oil can enter the combustion chamber, wouldnt it make sense that gas/air from the combustion chamber can enter the lubrication system and drastically shorten the oil life? the amount it consumes varies, sometimes 1qt every 1k, sometimes .5qt. i want to do 6k oci with syntec but am reconsidering now