air-oil separator

filter-separator

wood separator

baffle (separator, divider)

engine oil reservoir / engine oil tank

oil gauge / oil-gauge

air-oil shock strut

crankcase oil bath air cleaner

air-oil heat exchanger

air-oil strut

aerial refueling / air refueling / in-flight refueling (IFR) / air-to-air refueling (AAR)

air combat capable helicopter / air-to-air capable helicopter

air support field pack, field pack air support, airborne / para (air support) / Pathfinder Bergen

ammonium nitrate-fuel oil (ANFO)

A-oil

diluted oil

fuel oil barge (YO)

fuel-oil tank

gear-type oil pump

hydraulic oil

lubrication oil system

marketable oil

oil

oil carrier

oil filter

oil pan

oil pump

oil slick

oil storage barge (YOS)

oil strainer

oil sump

oil tanker

oil well