Lubing the lower bolts may get you a surprised 'thank you' in 30 yrs or so
The serrated edges of the bushing sleeve hold it still, so it's all in the rubber. It doesn't hurt to put some lube on the bushing ends, though probably not needed. Poly bushings recommend it.
If you lube, dont use patroleum or bearing type grease. Only use something safe for rubber, like lithium or silicone. I think moly is ok too.