I emailed Prestone about their Dex-Cool Extended Life 5yr/150K mile coolant, and asked what the shelf life was since I have some left over from a previous coolant change from a few years ago. The guy basically said it's good for 5 years, regardless if it's in the jug or in the car.
If that's the case, then why don't the coolant manufacturers put an "expiration date" on the jug? Was this guy correct, or was he just wanting me to go buy more of their product?
If that's the case, then why don't the coolant manufacturers put an "expiration date" on the jug? Was this guy correct, or was he just wanting me to go buy more of their product?