I've had a 2 cyl Craftsman air compressor for going on 20 years or more. I never expected it to last as long as it has, it is all aluminum crankcase and head. Long and short of it is: its wearing out, pumps a fair bit of oil with the air, all to be expected as I use it hard.
I've been thinking about building a shop compressor, something in the 10-14 hp range with a 2 stage compressor and 80 gal tank. It doesn't look like that is going to happen anytime soon.
I have an really old Craftsman from the early '70's 3/4hp V twin that I have used for tires, and will pump up my air start tanks if need be and I'm not in a hurry.
The Motor on my bigger Craftsman is fine so can re-use.
I came across this:
https://www.surpluscenter.com/Air-Pneum ... 1935-A.axdWhich you really can't beat for the price. It will bolt in place of what I have now, and I can even re use the belt and pulley. All cast iron lower with aluminum head. It was made for gas driven compressors, so is designed for contiious running, with a float switch in the sump for low oil shutdown. Should outlast my needs and for the price, you can't beat it. Only thing I have to change is the unloader, the head I have now has an un loader port in the head, I will change the tank check to one that has an unloader port in the check, and then plump the unloader line there. WIth continious running compressors, they use a discharge line unloader when the set pressure is reached, so no on loader port on the head.