Yes, you should grease the zerts. If overfilled, it will come out through the rubber dust cover on one of the 4 caps. You can tell when it's getting close to that. They don't need to be greased very often but they need grease.
Thanks. I'll grease them. It's likely that sometime in the car's past that the U joints were replaced. Did these cars come from the factory with greaseless U joints?
