I ended up buying the bus which led me to ask this question initially. I'll be monitoring EGT's closely over the next few months. But, I learned something in looking thru the CAT manual that came with it. CAT made turbo'd 3208's with piston oil squirters and without piston oil squirters. This is clear because there is a section on oil capacities which lists different oil capacities for turbo'd engines with and without oil squirters. I have no idea which hp engines were with and without or why the did it, but it does give serial numbers for each (which don't seem to coincide with any number on my engine).

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13