I'll go ahead and tell you that no company will warranty items that wear out with normal use. Maybe if something crazy happened and your piston and sleeve were gone after a quart (and you hadn't been running it insanely lean). It's really rediculous. You think Proline is going to give you new tires when yours go bald or something like that? There's a big difference between good customer support and a company bending over to take from customers.