[Tom]

I've never been into the gimmicks. That being said: Had a porsche 911 with a lifter tick and check engine light. The variable cam thing with them is a lifter with a rod in the middle that sticks up to activate the 2nd lobe on the cam, like VTEC on hondas. So our shop says its the lifters, need to replace at like $2000. A another porsche shop tells us to try some hydro lifter additive from liquid moly, then run the piss out of it. I'll be dammed if on day 2 it stopped having any issues, reset the emissions components and went threw emissions fine. That was almost a year ago and as far as I know the car is still good to go.