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.

I think the reliability issue is really a compatability issue with the newer engines (V6) in 1997. A few posts recently discussed that as well. They are both good transmissions and engines. The 1997 problem was fixed and is also mentioned here somewhere.

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles

Wish someone could advise me whether its worth for me to upgrade from 722.4 to 722.6(5 speed Auto). It cost me another 2000USD.Thanks