Subaru Coolant System Conditioner 2 Pack - SOA635071 - Genuine OEM

I am very skeptical about miracle in a bottle like "liquid engine rebuilder" but this is a product designed and recommended by subaru for subaru's, specifically for preventing and treating small head gasket leaks. That said, I do have a small/moderate external head gasket leak of about 100cc per 1000 miles. I can't pull the engine and replace the head gaskets right now and 2 bottles of this have dramatically reduced the leakage, much to my surprise. This is not a permanent fix but I would highly recommend it to be added when changing your coolant or if you ever notice a significant drop in coolant in one of these subaru boxer motors. If you have a known coolant leak you are on borrowed time even with this product and more significantly you are in danger of serious engine problems if not addressed. You need to monitor your engine oil regularly (daily/weekly) and if it looks milky or in any way just not normal you need to get those heads done immediately. Also, you need to watch your engine temp like a hawk and if it never goes above half way, such as mine, and then one day it is 3/4 to the top, not in the red mind you, but just a significant deviation from normal, you need stop get those heads addressed immediately. Head gaskets leaks can be tricky and if it is only an external leak (big if) you aren't in real danger of damaging your engine, but coolant to oil, or combustion to coolant leaks are emergent situations in my book. That said, I'll use this again as it did work for me, again, as a temporary fix till I get the head gaskets done.

I purchased this coolant conditioner suggested by a local mechanic for a heater core leak in my 2001 Jeep Grand Cherokee 4.0. I was having to fill my reservoir tank 2 to 3 times a week. I had a permanent wet spot in my driveway. Went to this reputable local mechanic and as he charged strictly by the book hours to replace my heater core, cost to repair was going to be $450. After turning down his estimate and deciding to live with the problem, he offered information about this coolant conditioner that he used in a dragster he owned and raced. I purchased the two bottles and installed it as per YouTube videos and within 2 days my leak was stopped and has not returned for a year now (knock on wood). I only used one bottle for my fix so I gave the other bottle to a friend that had a leaky system on a farm tractor and bam it fixed that also. GREAT STUFF! saved me $442 in repairs. Highly recommended!

I read that that Subaru, required this in the cooling systems, of their older Subys. We just had new head gaskets installed on our 07 Outback. I had previously replace the timing belt kit, and water pump. After we got the car back for the head gaskets job, I noticed that the engine would draw back more antifreeze, after cooling down, than it pushed into the expansion tank, when at operating temperature. I kept track of this, for a couple of weeks. I had to top off the expansion tank, to keep the engine and radiator full. I decided to purchase a couple of bottles of "Subaru cooling system conditioner". It said on the bottle, "shake before using". That was my clue that Subaru had issues, with cooling systems, and this was a sealer. After shaking, I drew out enough, from the radiator, then added 1 bottle. I gave it a couple of days to get through the system. Well, it's been at least 5 days, and the expansion tank level, is still in the exact same spot, each morning, just below full! This stuff really works! I could not see any visible leaks, before I used this product. It's much like engine oil in subarus. Subarus chew oil, but you never see where it goes, (out the exhaust!) (subarus are junk!) My Saab 9-3 oil, never budges! It's too bad Saab went bankrupt! At any rate, try this cooling system conditioner, it really works!

I'm not going to comment on the fact that Subaru built cars knowing the head gasket needed this conditioner or it would most likely fail. Subaru owners already lament this. I've tried this product before, and with our Subaru on it's last legs, I bought another round to see if I can buy a few more miles before retiring it. I waited until the main radiator was down to about 2/3 level, poured in a bottle, topped off the radiator and then turned on the engine along with the heater and ran it for about 30min. Slowed my coolant loss by about 1/2 initially, but after about 1 year, it's beginning to get back to that level again. I've read that there have been people who had success pouring in 2 bottles at a time......didn't want to risk plugging up the heater core, but may try that out next. Again, not a permanent fix, so set expectations accordingly.

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