Just bought Merc E230(W210) 96 model with 722.4 Auto trans. Any comments about the M111 engine and Auto trans. I've read from this forum there's some reliability issues on 5 speed Auto trans 722.6. Which is more reliable 722.4 vs 722.6. Any big difference between this two in terms of fuel economy since 722.4 is without lock-up clutch.