Buying the right coolant
Most DIYers buy coolant at the auto parts store where the product is labeled “universal,” meaning it works in all cars. The carmakers disagree. Over the past several years, they’ve issued service bulletins warning that “universal” coolants are often incompatible with the newer metal alloys and gaskets and seals used in their vehicles. The carmakers aren’t saying that just to increase sales of their proprietary coolants. They’re seeing real (and expensive) damage caused by these coolants.
If you use the wrong coolant, you won’t see the damage for a few years. But when you do, it’ll cost you a bundle. So heed the manufacturer’s warnings and buy coolant right from the dealer. It’ll cost about $6 more per gallon (most vehicles only need 2 gallons), but the peace of mind is worth it.