I gotta get out more. I live maybe 20-25 miles from the address on the bottle. Never heard of Mac's!
In regards to the comments on garage door lube. I too have had door techs recommend nothing but silicone spray lube. I'm sure they recommend that because the stuff is about worthless as a long term lube, but it won't hurt anything and it gives the homeowner a warm-n-fuzzy. I know if I greased up the works on my door bits, it's going to turn into a gritty, abrasive mess.
Nothing against "silicone spray", but I them more as a cleaner than anything.