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Blue Devil really works

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AWD-Tony

Proven Member
6,801
3,733
Sep 11, 2017
Cincinnati, Ohio
Just wanted to let you guys know that this stuff really works.

We have a 2003 Nissan Altima 2.5 that has 193,000 miles and it started having a really rough idle on a cold start. It threw a CEL for misfire code. Pulled it in the garage, pulled the plugs and when I looked inside the #4 cylinder, there was coolant pooling in. Literally saw coolant filling the cylinder. It's a common issue with these motors above 150k. Since it needed tires as well, we weren't sure about putting money into her. The interior and body are in great shape so I was torn. Looked into replacing the head gasket and the cost would've been about $400, but I was worried about getting the block decked as well since it had an aluminum block and I only saw MLS hg's for this application. We decided to try Blue Devil, $40 plus new thermostats and gaskets, $25. To my surprise, it worked! This was two weeks ago. No rough idle, CEL went away on its own and it drives like a champ.

I personally wouldn't use this on my dsm, but for any other car, I'm willing to give it a shot.

True mechanic in a bottle!
 
That's awesome that it worked. But on any engine with real power or high rpm's, as soon as you gas it the hg will disintegrate LOL

I’d imagine it will but it’s perfect for this application. Wish I knew the science behind it.
 
According to the guys on Youtube, it's heat activated. So once it enters the imperfect spot on the hg, it hardens and stays there. I'm not sure how much I like the idea of that though. I could see it hardening in spots that it shouldn't, and causing more problems.

This is more of an emergency type thing. Maybe I should buy some of this for my brother for his birthday ROFL
 
Tony, my youngest son used it on our DD 1989 Honda Accord and it helped but didn't quite fix it so he thru a 2nd bottle in it and that thing is still running around our town with no problems, other than the driver.....not really mechanically inclined but he is driving the car. That was 2 years ago.
 
I am hesitant about this but I'm in a similar situation. My daily is a 1999 toyota 4 runner with 295k. I know its leaking coolant into a cylinder. But it only causes problems for the first 15 or 20 sec of cold startup and it loses coolant over time.
 
Our Honda was basically the same condition Paul. I know I was calling it "snakeoil" and super skeptical, but since it was my son's money, I said, "you can try it" as a head removal would have meant removing 20-30 vacuum lines on that car that all went into one big "box" and would have been a nightmare to put back together.
I just know that it worked and is still working in the car, as we see it in town all the time.
That Honda wasn't a hotrod nor did it ever get the piss ran out of it. It was just the boys school car and somehow made it through 8 years of us having it and now a year with its new owner. We didn't have problems until about a year before I sold it so it is in its 2nd year with that stuff in it.
 
Once I was done with what the instructions stated, I let it sit for two days because I was waiting for a valve cover gasket. I check both days and it was dry.

Pauley it’s less than $100, that beats doing a hg on a v6 runner. Those things are a beast. It’s perfect for your situation. Try it and you don’t even have to thank me. Lol. All you have to do is pull the tstat and flush the coolant, add water but leave enough room for the amount of blue devil you’ll need. This depends on your coolant capacity. Pour slow then let it idle for 50 minutes and your done. Then just drain the radiator and fill w coolant. You can leave the rest in there.
 
We left ours in LOL.
 
Still working, as of August 20 2021. ROFL:)
 
Don't put this stuff in cars that will be sitting for a while unless you're going to drain the coolant before you let it sit (which isn't optimal). This is my Frontier that had a hole in the hg, the P.O poured a ton of that stuff in there (and possibly something else) and when it didn't work he let the truck sit for a few months and that stuff hardened and clogged up the engine. I would've only had to pull the head and have an easy job but then I had to clean it all out of the block, thermostat, and intake manifold.

I see how this stuff will work in most applications. But if you have a problem as big as this one it's like putting a band aid on a broken arm. And then you have to clean it up later. And also don't go mixing it with other chemicals because that's just asking for issues.

Also want to point out that I'm not trying to unvalidate anyone's point. It is a great invention and a cool discovery to keep those dd's on the road for a little longer. Just saying that if your engine is truly boned it'll make it worse LOL

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Last edited:
I was puffing a little white smoke out the tail pipe so I added a can of Reslone... ( not sure of spelling ) It cured the problem but I think I plugged my heat core.. Even today it still shows up in the over flow tank and rad cap.....
 
so is it some flavor of block fill? cause thats the first thing that pops into my head.

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Reslone... ( not sure of spelling ) It cured the problem but I think I plugged my heat core..
Screw that heater core, its not like you need a heater in canada. Put a couple beavers🦫🦫on your lap and your toasty.

Since you store your car for the winter, if its completely plugged up, don't even run the hoses to the core. just loop them on the engine.
 
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