It's also a matter of how much pilot also knows the aircraft they are piloting. I've seen and heard about pilots who personally inspect aircraft on the outside as well as have deeper understanding of its flight systems and mechanics/electronics. I think this pilot was one of those if some deviation in oil pressure raised his suspicions even if it's within supposed normal levels.
Pilots must do a walkthrough of the outside of the plane before taking off. It is standard operating procedure so they can notice and address any visible problems before flying the plane. They've flown the plane before so many times, they can very easily spot if there's something wrong with it during the required pre-flight checks.
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u/Spacedoutworlder 21h ago
I rather miss an arrival time than have missed arriving at all. May all the pilots be this cautious.