Many of the 16V motors used excessive oil due to piston clearance. The pistons are FORGED and require twice the clearance of cast (8V) pistons, & this can cause oil consumption. Oil pump is in the front cover & doesn't go bad unless the oil never gets changed! If you need a pump then replace cover. New version has 25% more capacity. On my Racecar I use gapless rings from Sealed-power.