Gentlemen:

Perhaps I should clarify -- my main point here is not the color, but the behavior.  Oil temperature is cooling with an increase in indicated airspeed, as one would expect from an air-cooled system (I referenced CHT as the airflow correlates too strongly with a decrease in temperature for even an air-cooled oil system). 

The 757 oil system is cooled via a fuel/oil heat exchanger on the downstream side from the reservoir prior to the engine; fuel is the 'heatsink', not airstream.  Having the oil temp cool as airspeed increases is not consistent with how the system behaves on this aircraft.

Attached file was taken from my EFB at FL410, TAT -22*C.  Would've been about .80 Mach.  Compare these numbers against the two-digit numbers you'll get at cruise and climb in the simulator version.  Unfortunately I can't legally capture climbout screens -- even from the EFB -- below sterile cockpit altitude.  Suffice to say that prohibition against advancing power until temps have risen to 50*C is consistent with RW practice, and that the temps tend to rise to what you're seeing in the pic, and stay there, without a whole lot of variance. 

This pic is from a PW-engined 757-200.

Cheers,

Jason

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