I own a Craftsman 1" scroller saw from 1969. I use it about twice a year. I opened the a front plate, and the cavity with the gears in it contains lots of very heavy lubrication, or grease. It's very thick and dark amber. The operating instructions say that the saw is permanently lubricated for the normal operating life of the saw, but I'm wondering if the grease needs replacing after 40 years. When I use it now, it takes about 30 seconds to get up to speed (probably while the grease heats up and thins out).
After I clean out the old grease, what should I use for replacement? Or should I just leave the old grease in there? What do you suggest?