Thanks! I had seen the first link, but the other two are a bit more useful.

Can anyone comment on a cross-country vehicle vs a passenger vehicle? It seems that for a passenger vehicle, 236.3 is the only right fluid, whereas for cross-country vehicles, 236.3 or 236.6/7 are usable.

Fastlane sells 236.6/7, as psf. It still isn't clear to me that what is sold is truly correct for ps systems, and it may actually be optimal for older ats used in our diesels.

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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)