The oil is for gear, flaps, steering, antiskid, and to stop the airframe from corroding.
Fixed.
Yes I've had to do a few emergency extensions in days gone past.
Better post something positive I guess ....
Best aeroplane I flew was, unsurprisingly, the 747 Classic. It's the best because it's fast, had four engines, lots of room, and a Flight Engineer. The only downside was that they carry about 15 hours of fuel, which is about 12 hours too much.