Received extended waranty offer for Mercury 2011 60 4-stroke EFI engine ( 1, 2, 3 or 4 yrs). Because of low annual runtime of about 10 hours, I'm leaning on declining. Engine runs beautifully now and with proper maintenance my sense is that it will run fine for many years but I don't know anything about its track record. Anyone have any waranty issues with the Mercury 60 4-stroke EFI?