WD 40 does little, as it is not a lubricant, but primarily a rust
I use household oil to put a drop or two into the wheel ball bearings - they
need almost no lubing, and tracks should be kept clean and dry..
For the rest of the door moving parts, hardware stores sell an 8 or 12 oz
tube of white silicone grease made for garage door screw drives as well as
chain drives. It is stable over larger temp. ranges than lithium automotive
grease (any auto supply store), but probably works just about as well. I
also use the silicone grease to finger into the pivot hinges. Since I
started doing that, the squeaks don't return for years at a stretch, vs
light oil or wd40.