What do you think of this? My husband has a sport black four years old in October, 24000miles on the clock, regular Mazda service. Engine siezed two months ago due to faulty valve in engine. New engine fitted, no good misfires, Mazda want us to pay 60% of the cost of garage work, probably 3\4000 pounds. I think Mazda have treated us shabbily what do you all the think?