Final update on this thread...
All codes are now cleared.
I sorted out the O2 sensors and the misfire codes went away.
Took a 10 mile drive with everything running smoothly and no codes.
I have a few more more common fixes to perform.
Will be doing fluid changes after a bit.
Thanks for the input. Hopefully this is useful to others.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,