K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz

Van motor was blowing white smoke and using a lot of water. Instructions said to use half of bottle of product for size of water system. It only would take quarter of bottle as that’s all that would go in. System was full. So follow the rest of instructions. Two weeks now no leaks.Amazing stuff. I have use the cleaper version of this stuff years ago and also had amazingly results.

Prius 2013 saved me $8500Shop said 3 pistons misfiringAlready had an ABS issuedRecommended new slightly used engine swap out.Towed it back home and gave this a try:Car completely cold, early am.Un-clipped hose from reservoir with pliers, filled with half a bottle well shaken using a small funnel - you will want a Small funnel.Started car and drove for 1.5 hours - ran perfectly and runs perfectly and just passed smog.I did not do ANYTHING else.Could not possibly be more satisfied with this purchase!

Does not work in 2000 Honda crv for sure. Immediately a plugged the system causing engine to over heat, not quite boil over but over heat.Had to drain the system and flush four times to get the glue out - still not sure it's all cleared out. Due to work scheduled waited to long to use this so cannot return - disappointing since the first one arrived leaking and received a replacement, in doing so we lost the window to apply/test the product prior to getting cold out.

I had a cracked head/leaky head gasket, could only drive about one mile before car would overheat and spue out coolant. Installed product according to directions and ran engine again according to directions. The leak was stopped, but the radiator was completely clogged by product, but, replacing radiator was a lot cheaper than replacing head or head gasket. I have driving car several months since treatment, and it is working fine. I give it a good product star. Now have driven car many thousands of miles and is working fine. Again, great product.

This WORKS! Saved me 8,000 dollars.

used this to fix a hairline crack somewhere in the block or timing cover.so i have a 2010 jeep grand cherokee with a 5.7 hemi motor, bought it real cheap due to haveing a head gasket issue due to an overheat , im a tech for 40 years and know these hemi's well ,i did all the work myself , replaced both head gasket heads were sent out and resurfaced and i did a valve job , the motor fired right up and ran perfect when finished , however i noticed my coolant level was dropping slowley with know external leaks , after investigating i found coolant in my catch can so know i knew that it was getting into the crankcase, after i drained out about 8 0z of oil from the sump i saw a little bit of coolant in there but not to bad and not a lot . the coolant seemed to be entering the crankcase but more as a vapor if anything because most was in my catch can. there was a hairline crack somewhere . i decided to try this but was very skeptical . and low and behold it worked ! i couldn't believe it , no more coolant in my catch can or in the bottom of oil sump , i was amazed it actually worked , its been a year now with about 7k miles and still holding up! no coolant loss ,no heater core or radiator issues, i did put a new thermostat in it after about 100 miles running on it and found some hardened material around it but i wasn't worried about it after i installed a new one . i recommend this if you have a small leak due to a crack .

sealed a damaged head gasket and or cracked head the was leaking very slightly where it would get tiny air bubbles in the radiator. temperature was running at 50% means (needle half way on gauge) with out thermostat and electric fan on full time so basically still drivable. it was a 3 cylinder diesel engine. after adding this according to instructions it stopped the bubbles and temperature down to 25%. it did clog the radiator a few hours and drive cycles later but it was flushable. I only used 1/3 bottle maybe even a little less. running it 1 month still good. however i tried it on a Toyota 22r engine with a severe head gasket case where water would enter the oil and compression into cooling system. it didn't work. it tried to for a few seconds or a minute things sounded better but didn't work even after second application. I even tried removing the spark plug on 1 of the bad cylinders to see it that would help give it time to seal with out the extra compression blowing out but it failed to work. basically it works on minor leaks but not major ones. save your money on the major leaks which is as expected.