So I changed the PureONE to a new NAPA Gold 1040 today in an effort to resolve the lifter tick in my car. Started it up.... Was gone, and came back again. Maybe it will take a while, but I doubt it. With the hood up, moving the throttle lever manually from the TB, when I rev it a little and let off the gas, it slows down and almost sounds like a few marbles bouncing around in the passenger side of the head. When I had the VC off the rockers didn't seem loose. Anyone have any clue what this is about? Didn't do it on the Pennzoil Platinum, but does it now on the Maxlife.