AeroShell - 22 Multipurpose Grease 14oz | MIL-PRF-81322F (2 Pack) Wheel bearings become extremely cold during flight. The instant the wheel touches the tarmac, they go from rapid acceleration to braking to a complete stop, thereby becoming very hot and also being subjected to runway spray/de-icing fluids. It's made up of synthetic hydrocarbon oil thickened with Microgel, with outstanding performance characteristics. AeroShell Grease 22 is designed to protect aircraft wheel bearings operating in these severe conditions. It's made up of a synthetic hydrocarbon and offers an alternative to AeroShell Grease 5 outside the Americas. AeroShell Grease 22 can help extend component life and reduce maintenance costs through its excellent load-carrying capacity and resistance to wear, corrosion, oxidation and water washout.