Has anyone has used blue devil stop and go additive? For blown head gasket or cracked block? Is this stuff works well? Does anyone knows?

 

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I've been doing car repair since 1974. I have never heard of ANY kind of chemical pour-in solution to fix something as serious as a blown head gasket or cracked block.
This is like "snake oil" at BEST. :-)
This would be like a doctor telling you to take an aspirin after a cancer diagnosis! :-)

 

Same with radiator stop leak or any "mechanic in a can " , don't use it . The motor runs on gas and oil , I don't even know what seafoam is but I wouldn't put it in the engine .

 

This stuff can work temporarily for small oil leaks, maybe even a rear main seal, but again....temporary. I would never attempt it for a long term solution. And I wouldnt assume it would do anything to a serious issues like a blown HG. Like others have stated here....its basically snake oil.

 

Thank you guys

 

Someone I know had some success with it. He had a van that was going to get junked anyway and wasn't scared to try the cheaper version of the blue devil magic bottle. It was the bottle you just add to the coolant and thats all. He told me how he did it exactly as the instructions told him. He watched as the temperature kept climbing and climbing and was sure the engine would soon be toast. But then it started to take effect and the temp went down and stayed in the middle. He only drove the van until he got something better, but it least it got him to work and back for awhile. I'm not sure exactly how long but something like a couple months. I had an old Nissan truck with a small pin hole in the radiator (all metal radiator) and used that copper powder stop leak stuff and it worked fine. It lasted at least a couple years. So sometimes it may make sense to use a miracle in a bottle product, but understand what it is your doing. Would the radiator stop leak work on a plastic radiator that developed a split in it? Would the blue devil work on an aluminum block and head that was severely overheated and warped, or that needed a special process to remove trapped air? What other areas could possible be damaged by the product?

 

I guess if your head gasket is blown you got nothing to lose , but with a radiator stop leak the product plugs small holes and that's what your coolant system is , small holes . I've seen many a plastic radiator gooped up with different stuff in an attempt to fix it . While it may have worked temporarily they eventually had to face up to the un-face uptoable and replace it .

 

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See, the problem I have with cheap "pour in" solutions for serious auto repairs is based on principle. After years of experience (since 1974) doing auto repair, I always lean toward doing service procedures the correct way, according to OEM guidelines.
This is always the best solution in the long run. I try to avoid being "penny wise and pound foolish."
e.g. If you put aftermarket sealer crap in the A/C system of your car to try to seal a refrigerant leak, you will then have to pay to replace the ENTIRE A/C SYSTEM!
It is impossible to repair an A/C system that has been contaminated with sealer.
The only people who may suffer from me sticking to my principles are snake oil salesman and others who try to sell easy-quick-cheap fixes for serious car problems. my $ .02 :-)

 

they need to take it simple honda coolant only unless that there is more probability even small amount of mini me issue can cause by cheap liquid