Success!
3 in 1 arrived today. Lubricated the hell out of everything, waited half an hour, still stuck.
Lubricated again, and it opens, a lot more quietly if a garage door can be quiet.
BTW, 10 W 40 makes a lithium grease to lubricate the roller axles.
You did not grease the tracks themselves did you? That’s a no no. Only the roller bearings, axles and hinges.
No, I did not.
It is the door that is rarely used. The hinges and rollers on the other door were relatively clean.
I need to open and close it on Sundays when I run the generator for a few minutes to keep the battery charged and the carb clean.