Thanks, NSEU. I don't recall ever checking it on the airplane. In the sim, a common question to be asked was how you could check the APU oil quantity prior to an APU battery start (probably a carry-over from the classic days).
Since the lower EICAS is unpowered in this situation (cold/dark), they wanted to see you select the inboard display selector to EICAS, which brings the lower EICAS up to the inboard display, which of course is powered by the APU standby bus. The sim would display the oil quantity, but as mentioned above, "don't believe a sim is accurate."
The whole thing was an exercise in futility because checking for .55 minimum was useless anyway -- the APU was not yet running.
The unintended consequence of this whole exercise though was that a lot of the anal pilots then felt compelled to monitor every battery APU startup -- because they could.