I haven't yet switched either of the Benzes to synthetic ATF but will be doing so at the next scheduled service. I have read on the Ritter/Easley list that it works out well, especially in cold weather areas where trans performance is compromised until the fluid is warm. I used synthetics (both Redline and Mobil 1) extensively when I used to live in Colorado and noticed significant improvement, especially during sub-zero start-ups in the high country, but better shifting in warm weather too. In fact, Redline 75-90 transformed a manual trans in an Audi quattro from being a candidate for replacement to quiet, smooth and slick shifting. Redline MTL is what the BMW guys use to get their cars' manual transmissions to shift as they should.

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Richard Detoy
'84 300SD
'76 Moto Guzzi 850 Le Mans