search 'knuckle pudding'....FSM says 140wt oil, but experience has proven that is probably too thin, and it leaks out. Full on No2 grease (chassis grease) won't be fluid enough to lubricate the kingpin bearing. So some people use a mix of grease and oil to get the right consistency. Some use JD cornhead grease. Some use a 00 weight grease like lubriplate or CV joint grease.