A Rolls-Royce Trent on a Airbus A380/A350XWB or a GE90/GEnx on a Boeing 777/787/747-8 takes about 30-40 liters of Mobil Jet Oil or Eastman Turbo Oil and several gallons of Skydrol or Hyjet fluid. And the jet engines are topped off after every long flight or at an A check. Steady income for XOM and Eastman unlike the price-point hoi polloi.Yep - gearbox for a cement grinder is not like a sexy race car - but makes big money whilst being tough on oil …