Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Situational Awareness
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem
Aircraft
On ground in ZZZ; after APU was started; there was a slight odor of oil in the flight deck. Smell dissipated and then we noticed it again upon landing in ZZZ1 once APU was started. Flight Attendant notified us once we reached the gate that he also smelled an odor on landing. [I suggest] better maintenance of APU; oil filters; etc.
Air Carrier First Officer reported an 'oil' odor during preflight which dissipated and returned on landing.