Look, I have had that Redline in my transmission for years... and I drive mine at least a hundred miles ( not a typo ) a year.....and there has been no detectable change in the shifting feel....
Is it really proper etiquette to compare our MB's with ' those other cars ' ?

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Dunno if the MT in my 91 BMW is THAT much different from your w123. Those E30 cars were designed in the late 70's/early 80s versus early 70's like a w123. Was there much change?

Just relaying my experience with Redline MTF. If you like the shifting feel, ignore it. Using it many years, I didnt like the feel after about a year of use, and so I found something that did better in my application...

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)