Gm top engine cleaner
Team Owner
Joined: Oct 2006
Posts: 20,393
Likes: 431
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17
NCM Member '09
Sadly, GM discontinued the good top engine cleaner, when rats in California were getting cancer. The stuff they market now is a pale shadow of what it was. 
Banned Scam/Spammer
Joined: May 2007
Posts: 15,685
Likes: 1,330
From: Machineguns, because I don’t compromise
My experience is that it doesn't work.
Had front knock sensor codes intermittently. Changed the knock sensor same thing.
Seafoamed properly on a running engine. Smoke show. Knock code gone for maybe a day.
Pulled cylinder heads. Carbon that it took a wire wheel to remove. The exhaust valves where coked with rock hard carbon.
If you have serious carbon, literally NOTHING will do the job of physically removing the heads and getting after it.
I could've soaked that carbon in any solvent imaginable for a week and it wouldn't have broken up. Stuff on the exhaust valve stems was like diamonds.
Had front knock sensor codes intermittently. Changed the knock sensor same thing.
Seafoamed properly on a running engine. Smoke show. Knock code gone for maybe a day.
Pulled cylinder heads. Carbon that it took a wire wheel to remove. The exhaust valves where coked with rock hard carbon.
If you have serious carbon, literally NOTHING will do the job of physically removing the heads and getting after it.
I could've soaked that carbon in any solvent imaginable for a week and it wouldn't have broken up. Stuff on the exhaust valve stems was like diamonds.
Thread Starter
Drifting
Joined: Aug 2014
Posts: 1,621
Likes: 174
From: North pole
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2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
Instructor
Joined: Jul 2009
Posts: 110
Likes: 4
From: Southeast Michigan
I have used it and it works great .Best stuff out there . I use it on many cars that have low compression due to sticky rings and it works . Why are you trying to use it and what are you trying to do is the question ?
Thread Starter
Drifting
Joined: Aug 2014
Posts: 1,621
Likes: 174
From: North pole
Im getting my car street tuned.. i have 31,000 miles and im the 2nd owner..car did alot of sitting. I figured it cant hurt. car has no problems. My friend used it in his c5 and it made a huge difference..same thing car sat alot..
Last edited by 04zjimc; May 8, 2018 at 10:37 PM.
Racer
Joined: Feb 2018
Posts: 252
Likes: 21
From: Meridian Idaho
Read somewhere GM suggested doing it every 30k miles. The master cylinder hose is what i used.
while in the airforce a mechanic from maintainence poured water down our poor ruuning chev truck, we ran it on 73 octane
while in the airforce a mechanic from maintainence poured water down our poor ruuning chev truck, we ran it on 73 octane
Last edited by Yokesc5; May 9, 2018 at 01:52 AM. Reason: Addl info