I've got a great little Fini Biscout, I drain it pretty much after every use, esp. in summer. I let all the air out and let the compressor run a bit until all the water has been blown out. When it's really humid, I'll let it fill back up to about 50# and then I'll drain it again. There's usually some residual water left over.
When I used my roofing nailer on hot summer days, I would also notice condensation blowing out of the gun when nailing. I'd make sure to add a little extra oil to the gun on days like that.
Reminds me...I should change the compressor oil soon. 
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Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired
"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon
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