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Editorial Review :
The Blue Devil Engine and Cooling Sealant has the remarkable ability to repair and seal leaks in freeze plugs, leaking radiators and heater cores, cracked or warped heads and fix most blown head gasket by forming a permanently seal. The Blue Devil Engine and Cooling Sealant will also work on internal gasket leaks, where small amounts of coolant seep into the engine oil. Contains no solid or particulate matter. It is non-clogging and will not harm your engine. Bonds to metal, aluminum, cast, alloy or plastic. Is safe and easy to use. Works on cars, trucks, vans and SUVs with gasoline or diesel engines. Independent laboratory tests and confirm Blue Devil is the only sealer known to form a permanent seal and does not rely on particles, temporarily plugging leaks.
Customer Review :
DO NOT USE under any conditions!
I put this product in my 2003 Monte Carlo for a small seal leak. The product claims to handle all leaks small and large. Well, almost $1500 in repairs later my car runs but I still have a clogged heater-core and no heat. Blue Devil didn't fix the leak but instead it clogged my water pump, almost all the hoses, and obviously killed my heater core. After two days of driving I almost blew my engine because the cooling system was so clogged. Do not use this product unless your willing to take a gamble on it. Do your research online...this product pops up on many message boards with as a red-flag.
Rating : 
Blue Devil is an Amazing Product
When I saw the bottle I was skeptical. I didn't notice any fillings, pellets or sludge in the bottle so it seemed safe enough to assume it wouldn't clog my system. I called the tech line and they told me they had a 90% success rate and it was money back guaranteed if it didn't work. So I guess I didn't have anything to lose. It was $65 vs. $1,400! They explained to me to follow the directions exactly. But they did tell me a few things that I noticed were not on the bottle: Count 30 seconds to a minute when pouring the Blue Devil into the radiator before the 50 minute idle period and then put up to 2 hours of road time before I drained the product. Super quick and EASY process of 5 steps that was road ready in 2 hours and 35 minutes.
Before: Blowing a lot of water and a cloud of white smoke out of tailpipe and considered selling car cheap.
After: Stunned, running great!
Rating :
NOT a Permanent, Long-Term Fix!
We had purchased a used 2001 Subaru Forester that we soon found out had a small head gasket leak. It would run for about 1-2 hours before it would slowly start to overheat. After the 1-2 hour period of running, the colant would be completely consumed. To me, this easily classified as a small leak.
We were low on money and after speaking to several mechanics about head gasket repair, we heard about the Blue Devil addiitive. After reading some reviews about this product, I decided to use it. I followed the directions very careful, including a thorough flush of the cooling system and removal of the thermostat.
The vehicle ran very well after the process was finished. There was no more overheating and the cooling system retained it's proper coolant level. HOWEVER after about 5,500 miles of vehicle operation, apparently the additive failed. The engine began to overheat once more, consuming all of the coolant. This time, however, the gasket leak appears to be much worse, as the vehicle can only be driven for periods of 30 minutes, instead of the 1-2 hours it could be driven BEFORE we used the Blue Devil additive.
My advice is to NOT use this product, unless you are one of those selfish people who want to make a temporary fix so you can sell a faulty vehicle to someone else (like someone did to us in the first place).
This product does NOT produce a long-term, permanent seal!!
Rating :
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