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by MIchael R. Kujawski
(Watertown, WI)
I have an Alton 3.2 gallon, 2.5 HP air compressor, about 10 years old. Thank you for the information about changing the oil.

However, in the process, I broke off the Oil Fill Plug.
The hardware store I bought this at has closed, so I am clueless as to where to look for a replacement. The Alton Industries website is confusing and the Home Depot site may carry it, but their schematic is rather crude and I’m not sure if it is the same thing.
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Oil plug
by: Doug in s.d.ca
It might be a press-in affair, but you say “broke”.
Can you put up a pic, or three or …
I bought an Alton 3.5 gal/2.5 HP at a yard sale with no manual. What oil does this air compressor use? It runs o.k. but just quit building air pressure, I think it’s low on oil . With no manual, I don’t know recommended oil to use or amount it takes to fill compressor to full. Would like to find owners manual also.
Alton
I am looking these parts