They sell insulation kits at the local big box hardware store and I cringe every time I see them. The box weighs about 15 pounds, which doesn't sound like a lot. It is definitely enough to un-balance a garage door. The springs are calibrated for the weight of the door, and adding weight makes the door "heavy" for the springs. This means that if you pull an operator disconnect handle when the door is in the open position, the door is likely to descend much more quickly than you anticipate. People have been hurt when a garage door came down on them and the momentum knocked them over. Only add weight if the door springs can be re-torqued or replaced with springs of the proper pull.
Overhead Door® openers and garage doors are built with longevity in-mind. By performing a few routine tasks, you can help ensure your garage door system stays safe and stands the test of time. One important part of garage door system routine maintenance is to make sure the photo-eyes have not gone out of alignment. The photo-eyes are the infrared sensors which monitor whether the space at the bottom of your garage door is clear. When these sensors are not lined up properly they will keep your door from closing. Make sure to occasionally check your photo-eyes’ alignment to ensure they are correctly detecting obstructions to keep your garage door safe and operating properly.
I'm not a professional, but I watched as my garage doors were serviced last year. The tech used a spray lubricant (I had bought a different brand in the garage door section of a home improvement store). He sprayed the inside of the entire track, top and bottom, the rollers that ride along the track, and all hinges on the door. He sprayed each hinge twice -- once on each side. The techs were more generous with the lubricant than I was when I'd done it before, so don't be afraid to give it a good squirt.
Garage Door Opener