I honestly know nothing about GM engines, but Fords I know. And Fords last forever. I have a 1996 windstar with 220k miles, a 1996 mustang with 180k miles, i have a 2000 focus with 150k miles (i drive a lot if you've noticed) and my uncle has old f-150s and f-250 coming out of his back side. Ford is in a dead heat with toyota and honda for quality and realiability (but toyota is falling back at an alarming rate). Something else to consider, is that Mercury was rated #2 in reliability, even though they are exactly the same as ford (the only difference is minor design details) engines, transmissions, etc. Check out the link below, it might change your mind.