Now that we're on this topic...

What's the difference between the fluid on the 722.4 transmission fluid and the 722.6 transmission fluid? I noticed that the trans fluid dipstick is sealed the same on my 1995 C280 and the newer MB's.

If the transmission fluid is the only difference between the operating of the 2 trans' then why couldn't you use the transmission fluid that's used in the 722.6, in the 722.4?
What mechanicality (not a word...) of the 2 transmissions makes the 722.6 transmisison 'capable' (to be tested) of a lifetime fluid, and not the 722.4 transmission, persue (sp) ?? I hope that makes sense.

In other words, if you were to use the "lifetime" (I wouldn't bet on it) transmission fluid in both the 722.4 and the 722.6, then why would it only be ok in the 722.6? Is there something special about the 5 spd 722.6 that makes it capable of a lifetime fluid as opposed to the 722.4?

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)