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The actual oil the military wants you to use costs $50.00 a gallon. It's a RAPCO brand. Cannot remember the number off the top of my head. So just use a good light weight oil like Gimpyrobb said.

That's true. You need to pull the tube off on them.

Did you pull the plug like Doghead mentioned ? It is a square head pipe plug in the very back of the "air-pack" (booster) . The plug is on the left side.

Just to clarify for you, he means the engine running with "NO" brake applied. There should be no air at this time. If there is air present then the "air control valve" is not working correctly. Could be gummed up.