Don't be foolish... Drive your cars!!! This engine will do a million miles if you do all services on schedule I put 740000 on a 4.5 of a 1972 vintage. In my first 100000 with a 2005 coupe ONLY had to replace C.P.S. and the seal on that 15.00 transmission plug. Go ahead drive em. Don't even think about the miles... Think about the love