Oil temps for the 757-300 seem to atrophy as speed increases, behaving almost as one would expect a CHT gauge to read.  The temps indicate yellow at 11000 because that is when -- considering acceleration above 10000 -- IAS picks up enough to drive the temps into the yellow. 

This behavior is consistent across  both 757-300 models (PW and RB), however the PW is consistently 10* warmer than the RB so it does not "go yellow", despite the temperature atrophy with speed increase.

This behavior is not consistent with the actual aircraft, and thus I strongly suspect a bug at work here.

I have not tested with the 757-200 series yet.  Will try that later.

Cheers,

Jason