Should You Grease Rubber Bushings?

Best lubricant for rubber bushings

If one of your bar bushings is squeaking, you should oil any other bushings on the bar before they begin to squeak as well.

Is it OK to grease rubber bushings?

Any silicone lube says right on the tube of paste or spray can that it is harmless to rubber and able to withstand significant heat. I recommend silicone paste since it's thicker than spray lube and therefore more likely to stay in place.

Are you supposed to grease bushings?

For traditional bushing materials like bronze, lubrication is simply a requirement of the material. Lubrication requirements mean not only more maintenance but more muck.