If aluminum based grease is a lot more water resistant than lithium grease, why does it seem that all car CV joints use lithium instead? This includes CRC/Sta-Lube #SL3174: "lithium 12 hydroxy stearate grease fortified with 3% moly disulfide and extreme pressure and anti-wear additives. Contains rust, ccorrosion and oxidation inhibitors. Extends life of C.V. joints."