OK Folks, really interesting comments about Redex etc, so I thought I’d start a similar tread. I have recently been recommended an engine and auto box treatment called Prolong, ( http://www.prolong-uk.com/new/index.html ). In one test they treated a car with the stuff, then drained all the oil out and drove around New York all day. The car was fine. So, has anybody on here tried the stuff or does anybody have any comments, positive or negative.