Does this stuff go bad? I have two unopened quarts of it in my garage and I'll be doing a coolant system flush before changing out my old oil cooler. I bought the bottles about 3 years back and never got around to using them. I think they should be alright, but wanted to check.

 

I think it's a safe bet that if it had an expiration date it would say as much on the bottle. This is a product dealers use in their own service departments so they would need to know about any expiration date.