as i mentioned above i am in way qualified to adjudicate the law, but it seems to me that the compared to even Porsches' other produces, the 986/996/987/997 have suffered a very high number of failures at very low mileages, and the number of multiple and continuing failures with no absolute discernible trend during and after warranty is indicative of a product that is not fit for service.
aircooled porsche engines have a very good reputation for life and service... thats why they have been such a sought after sportscar.
the rub here is that because not evreyone drives their 987 (et all) 12-20,000 per year, in many cases the warranty has already time expired and the vehicle may have less than 25,000 mi. i as the second or third owner have a very low mileage vehicle with the desire to enjoy it for a long time, ...not so fast Tonto, do not pass go do not collect $200... you need a new engine, much worse that a game of monopoly
i think that the history of ongoing failures and the lack of being able to predict them should be seriously considered as part of the claim against the manufacturer... the 5th or 6th owner buying a used one at 10 yrs of age and 100,000mi should not be expecting anew engine, but some pro rated assistance would be appropriate.