Since when is a 'valve seat' a separate part of the head? It sounds like a BS answer to me; one which I'd let some lawyer chew on. AFAIK the head IS a lubricated part and the seat is integral to the head assembly, even if it is pressed in. If its not being lubricated then its the fault of the manufacturer for not designing it to get lubrication. I smell a class action lawsuit coming real fast...you might hate lawyers but it's BS answers from car makers like this, trying to skirt their responsibility that keeps lawyers in business. That's a manufacturers defect; pure and simple, insufficient interference fit between the seat and head to retain the part under normal operating conditions or a failure of the metal to retain its shape. Chrysler has had a rash of this - it was happening a LOT on their 426 hemi heads sold in the not-too-distant past.