The S 320 do recovers from its weight disadvantage in terms of its higher end ratio rear differential.

It is less economical, obviously (weight and differential ratio)

I have to disagree on the comment about the 722.5 and 722.6. Here the dealer and all independent shops talk horrors about the 722.5 (being the first try on an electronic 5-speed, almost 35% more parts than the 722.6 and very sensitive to sudden failure).

On the other hand, the 722.6 is praised and regarded as very reliable. Not as cheap to run and rebuild as a the 4-speed, but then, it is far way superior in terms of comfort and efficiency.

Only thing to consider on the 722.6: do change the oil on the 722.6 at least every 50,000 miles! The fill for life motto was disregarded many years ago.

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]