I Work at a service station during the late 60's and early 70's. We use the same type dispenser to pump 90 weight lube into vehicle rear ends when we had them up on the rack during oil changes.
I got a 80-gal Dewalt single stage compressor for my new shop. I got it from a Atwood Country store at Clarksville Arkansas. They put them on sale from time to time. I like the three piston compressor, gives more surface area for cooling of the compressor. Been pleased with it so far.