I've used synthetic 85W-140 gear lube with good results - - - -it seems to work better at high temperatures. Taking the cover plate off and flushing any metallic residue out will help keep that displaced metal from being its own grinding compound.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!