My Central Pneumatic air compressor machine creates smoke

Hey, Everyone!

I have a Central Pneumatic 21 Gallon air compressor. I bought it a few month ago. Its [COLOR=#444444][FONT=&amp]2.5-hp motor producing 125 psi of max pressure and 5.8 CFM at 40 psi & 4.7 CFM at 90 psi. This air machine is generally quiet and most powerful of the air compressor market.
But Nowadays I faced with a critical problem. This air machine creates smoke from the starting of the run. Why?
Please advise me to solve it.

Thanks[/FONT][/COLOR]

My first guess would be oil vapor. A quick check for oil discharge from a compressor is to put a piece of white paper (with a suitable backing) in front of the discharge for a few minutes and see what collects on the paper.

I will try to [COLOR=#333333]il discharge from a compressor.
Thanks[/COLOR]

But Can you tell me how much reason is responsible to create smoke? Example

[QUOTE=olivia_lisa;14641]But Can you tell me how much reason is responsible to create smoke? Example[/QUOTE]

It most likely is oil vapor due to the pressure change form compressed to ambient.