When lubricating your garage door opener find out what type of opener you have. There are 3 basic types of openers. Chain drive, screw drive, and finally belt drive. Lets start in that order. Unplug your garage door opener. You will need to have a low temp grease called lubriplate. Look for a nylon gear inside unit and coat liberally on both gears. Next you might want to tighten chain due to it stretching over time. You can also lube the chain with a light duty spray lube. That covers the chain drive.