I cleaned up & re-greased my sister's KitchenAid Model 4C which my sisteter inherited from our Mom which our Mom inherited from our Grandmother. It's been making noise because the gears aren't getting any lubrication especially at speed #10. Instead of just re-apply the older grease to the gears, I went ahead cleaned & re-greased it with "Lucas Red n Tacky". The old grease inside was super high quality. I was surprised it was a 1960's grease and the grease didn't leak at all during it's service. Not dried as if you just opened a new grease tube. Now the mixer is working like new after it was re-greased.