so i have used this stuff before, its called 4 cylinder restore, they also have the 6 cylinder and 8 cylinder applications. comes in a silver can, you can get it at any auto parts store. it has little metal shavings in the can that you add to your oil thats suppost to bond itself to your cylinder walls to restore compression and so on and so forth. WHAT IS EVERYBODYS OPINIONS/PERSONAL EXPERIENCES WITH THIS????