Other lubricant vehicles which may be employed are, for illustration, mineral oils in the lubricating oil viscosity range, i.e. from about S.S.U. at 100 F. to about 300 S.S.U. at 210 F. The organic thickener useful in this invention may be a high melting aromatic urea, diurea, amide, or di-amide containing the following structure: ll ENE-0- wherein R is an aryl radical.