I've been told by a mechanic that my head gasket is blown. Does Bars Leak Head gasket & coolant sealant work?
No. My experience. Maybe to get you home, but it's temporary at best, and think about it: goop in your engine looking for holes to plug. Like oil passages. Some guys swear by it.
Some people say it works. I believe in a proper repair, but I guess it can't hurt to give it a try.
I would say 50/50 chance of a temporary fix.
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