How to recondition/perform maintenance on old but working Braun KM32 mixer?

Hello, I bought a vintage Braun KM32 mixer yesterday, and cleaned it up perfect, and took off the bottom part and vacuumed/cleaned up old dirt, but my husband says that grease should be also added to keep this old beauty going well. I am trying to figure out what kind of grease, and where to add it exactlyl I love this mixer, and would like to keep it going for a loooong time. Any advice????