I went to a local CAT dealer and asked about Trans.fluid a couple years ago. I was told that 30 years ago when CAT recommened using tran.fluid when changing fuel filters, the fluid did not have as many additives as in it as today. My mechanic say's MB recommened using it then...but not now. Too much ash.

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1983 300SD 343K everyday car
1983 300SD 285K from junk yard-tooks parts from deer car- runs great. Brothers car.
1984 300SD parts car-Hit deer
1979 300D 175K non-turbo "Doctor"
1979 300d parts car