Anyone can sue anyone, I suppose, although personally I try to avoid suing anyone who can afford a better lawyer than I can ;-). Actually, the way it seems to be going, Lycoming's being much nicer about this than I imagined. They're doing other engine maintenance while the engines are torn down; that can be worth a tidy sum and can prevent more downtime later. Rob wants a new oil cooler, so he just might come out ahead on that alone. Rumor has it they're paying for business class tickets in cases where business travel would have been done by an affected airplane. Piper, manufacturer of the airplane but not the engine, may step in on planes still covered by Piper warranty and cover personal travel.