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Re: Oil for turbocharger

>On the early turbos (e.g., my '83 Turbo Quattro Coupe), there is a separate
>oil filter and feed for the turbo, but it's driven off of the common oil
>sump/pump/pressure/etc. The second filter is right above (and at right an-
>gles to) the main oil filter, and is somewhat smaller as I recall. I be-

I think they may have still done this clear up to '86 or '87. My '84
5000S turbo has the same two oil filters.

>lieve in later years, they "integrated" the turbo better with the engine,
>so that there was only one filter/etc... (and added water cooling, and...)

My '84 has a water cooled turbo, even a little electric coolant pump that
kicks on to cool the turbo after the engine has been shut down. I was really
amazed when I first saw this... I was also amazed when I saw the little
fan and duct system that they had designed to cool the fuel injectors 
after a hot shut-down.