I had two Micro Trols go bad. Called Lunati and the first thing they said was only two things will wipe out a cam lobe, not enough zddp and to much spring pressure. I told them I took out the inner spring and added a zinc additive. He said send it in and we will look at it. Im going to bet they say it was my fault. Oh well, it only cost $10 to send it to them. alot of people are getting bad lifters