I give some of my oil to my Dad to put in his truck. Seriously! He has an '80 GMC stepside that he bought new, and the engine has seen better days and uses quite a bit of oil. I only run my oil 2 to 3k miles usually, so it's really not that bad. The truck is still pretty straight, and I hope he restores it someday. I take the rest of my used oil to Auto-Zone.