Not Ranked
Bars leak is one of the best automotive products ever invented. Every new car manufacturer utilizes some type of leak preventative product such as bars leak. I have numerous GM and Ford dealership service manuals (the one's like phone books) and they clearly state if the cooling system is drained to add 4 tablets.
You cannot go wrong putting a dose in. I had an old Lincoln Mark 4 with a 460 and the water was a stream comming out of the radiator, put the stuff in, stopped before my eyes and sold the car 4 years later.
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