I have a Genie Excelerator garage door opener. It has a screw drive. Having a problem with it (somehow the wires got pulled out of the close limit switch), I finally got around to reading the manual. It suggests re-greasing the drive screw yearly, but "ONLY" with their lubricant, called GLU-3. I found some specifications for it here:
The thing is, I already have a 1-lb. tub of Mag1 Hi-Temp Disc Brake Wheel Bearing Grease (bought for repacking my bike's hubs) that I may never use up in my lifetime. I can't find my receipt for the opener, so I may not be able to get warranty service anyway. My only concern about using the wheel bearing grease is that the GLU-3 is rated to -30 degrees F. I'm not certain if the wheel bearing grease is rated for that low of a temperature, but I would think that a car would be even more exposed to cold than the opener is.
It seems to me that the wheel bearing grease would be fine, and if it'll work, I'd rather use it instead of having to buy something else. I know there are some folks here that know their grease more than I do, though. What do you think?