Longston
Thanks for noticing my absense. Gone for a few days. I heard of the ATF at fillups twenty years ago with a 220D. I'm using Redline now at slightly more than required levels on the intuition that more is better (which isn't always right). I like the idea of addition lubrication for the IP, but a little ATF or oil (or Redline, for that matter) to 20 gallons doesn't seem significant. Again that's intuition which is not so dependable with internal combustion engines.
In the biggest sense it interests me that "we" can design and manufacture something as complex as a MB desiel, but it remains an open question as to what happens inside them. Wouldn't you think there would be an absolute right or wrong answer?
Anyway, thanks for all the comments on this subject.

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Dan Stadt
'85 300D turbo
'79 300SD
'73 220D