I'm going to install a Koyo wheel bearing over the weekend, and Toyota states to apply a MP grease onto the inner races before inserting them into the bearing itself - then press the hub on. I have the bearing, it is lubed with a off-white grease that looks like regular lithium grease - but I do not know if this grease is urea based. I'm assuming it's Shell Alvania #2, Koyo does list Multirex SRL, Chevron SRI, Exxon Polyrex EM and Shell Alvania #2 as their factory lubes.