Have a lot of Viper time in an HS125-600. Oiling the engines was done only when needed. Checking them was at every possible opportunity.
Rarely did those two numbers diverge.
A lot of Spey time in G1159's. If they weren't dirty on the bottom of the cowl, it was because you held 300 knots until final, or they were out of oil. Many a time in Newfoundland on a tech stop, it was 5 minutes to refill the sumps (2x2.5 minutes). Max human exposure time on a ladder in 40 knots at -30F was 20 seconds.
Tays..... Brand new airplane. New owner standing at cargo door waiting for a particular bag to emerge from hatch. Sees a drop of oil draining from cowling and asks why does a brand new plane leak oil?
Had to smile. That's not a leak, I said. That's a sign of progress.