My 1994 3.4L is pushing just over 121k miles and is starting to let out little puffs of smoke when I crank it, which is most likely just the valve seats, no big deal. But my question is if anyone has ever used any of the various types of oil additives (e.g. X1R, any of the Lucas variety, Slick 50, etc.) I haven't ever thought of using such items because I have never ran a car as long as this one, but I like this V6 for some reason. Just wanted to know what everyones opinion on this stuff was.

 

Since nobody answered, and in case someone else needs to know, I done some research and went with the Lucas Oil Stabilizer, it seemed to be the best out of all the reading I done...