the truck sat inside a barn for years, 20 is what I was told, then parked out side for a few more, not sure when it started seeing use again, about 3 years ago but that owner isnt around so I cant ask, I would think if the rings were bad it should smoke which is some thing I have not seen, leaks, maybe a puddle 2 inches in diameter over night.it runs great, plugs dont look that bad tail pipe is dry, thinking about soaking the pistons for a week with sea foam or Marvel mystery oil