Years ago I was a quality engineer for an engine manufacturer. We had a batch of engines failing longevity testing in the lab and getting returns to dealers for premature ring failure. To make a really complicated story short, the pressed in liners were the wrong grade of cast iron supplied by a large Chinese foundry that cast cylinder liners for a lot of different engine companies. They had different grades depending on their clients specs. The line that cast ours was down due to an unplanned outage, so to make delivery, they just used a different lines grade for the pour and shipped them. Never said a word and tried to deny everything until the law suits started. We ended up with an entire warehouse full of assembled engines that had junk liners pressed in that we couldn't sell. When I left, they were still locked up debating on how to salvage them.