I have a ticking noise on my rover that has been getting progressively worse as time goes. I am concerned it is a sleve getting ready to go. I do not know the complete history of the vehicle, but I assume that it's temperature was redlined due to it being in California all its life. It is more likely that it is a valve, rocker, lifter, or cam shaft problem. However, I am still concerned. I have not done a compression test yet, and I should :x . I am thinking about buying a used engine and rebuilding it for the time when the current one finally does go. I tried some additives to see if they would clean some stuff out, and nothiing. Right now the rover sits in the garage waiting for new tires, as the current ones are dangerousely worn. So I haven't had a chance to drive it other than random puts around the neighborhood.