![]() Trying to fix a major internal head gasket leak with this stuff is like trying to plug a leaking dam with your finger, it just wont work. For all your automotive needs, look to our in-store automotive experts to help you find parts for your car. He showed me with a flashlight and sure enough I could see green coolant liquid seeping through the heads. Find Auto Parts, Accessories, Tools & More. This product received a total score of 8.62 out of 10, based on review sentiments and user opinions related to 7 features: Easy to use. BestViewsReviews Ranking and Score for Subaru SOA635071 OEM Coolant System Conditioner. I took it to my mechanic who took one look at the heads and told me I'd have to do them. The analysis indicates that around 40 reviews were positive while around 60 of reviews had negative sentiment. The only sign was after driving it would puff smoke out of the hood and a smell of burning coolant while driving. No overheating at all, no coolant in the oil/ vice versa, no bubbles in the coolant overflow tank. My symptoms before using this stuff where minimal. Generally, those are the much less severe head gasket leaks. It's worth mentioning that this stuff will really only work as a band aid fix like this if it is an EXTERNAL headgasket leak. After 3 weeks of daily driving, the car seems to be 100% fine (for the moment). I suspect it was just remaining coolant on the engine block burning off. At first I was disappointed as after my initial test drive I was still seeing smoke under the hood but after a bit of driving it was gone. I put 2 bottles in my radiator after removing a small amount of coolant to make room. Per instructions on the bottle, you can just pour it into the radiator and drive. For $12 I really didn't have much to lose! The one thing I was worried about was it clogging up the heater core or thermostat, as some of the other "head gasket in a bottle" products out there are known to do. ![]() ![]() Before forking over nearly 2k to the mechanic who had diagnosed bad head gaskets, I read on a forum somewhere about this stuff and after seeing a lot of positive reviews here decided to give it a shot. In my situation though, I knew I was getting rid of the car in just a few months and only needed it for some light driving in the meantime. The additive is called Subaru coolant conditioner. I got some off amazon and it sealed a tiny coolant drip in 2 different Subaru’s that I owned. I know it’s recommended for the 2.5 liters in the owners manual. Holy crap it worked! I am always very skeptical of the "fix in a bottle" products and I still maintain that if your head gaskets are leaking and you are planning on keeping the car for a while, you should just pony up the $1500 to do them (and do the timing belt while you're in there). I would add the Subaru coolant additive after flushing and refilling. ![]()
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