Well it worked and saved me $2000. I know it's not a permanent fix but it got me passed smog. I have a 2000 f150 with no access to the radiator. It says it works best with direct access to the radiator. So I reminded the main radiator hose clamps and poured it right in that way. Key the truck idle for 30 minutes and let it cool. Tried it the next day and still white smoke or the exhaust. I was pretty disappointed but noticed the smoke had stopped sooner then it usually did. Same thing the next morning but the misfire served to be gone. Next day minor smoke and the check engine light had went away. Woohoo was I happy.

Good book. After reading book and taking supplements I bought here I truly think my HGH levels are better.

Disabled my hard drive! Seemed to install, then all I could get on the screen was "Recovery - PC needs to be repaired" ! It apparently had messed up my boot record! Had never in 50 years had such a bad program. I could not boot up, could not get F8 to help, etc. I am a along retired computer guy, & can usually work around poor programs, but this was very bad. It took all day to get rid of it - & get my computer back. Their FAQ's, Help, forums, did not help in any way. I tried chat - but after 1/2 hour wait gave up. Do not buy.