Why was a cooling system additive used when car was serviced? Car Doctor

I had the radiator serviced on my car; just preventive maintenance. I noticed on the repair invoice I was charged for a ...
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Mechanics say this fluid leak should never be ignored

A fresh puddle under a parked car is more than a cosmetic nuisance. Mechanics warn that a stray drip can be the first visible sign of a failing system, from the engine to the brakes, and that waiting ...