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Suggest you not drive very far with the air leak. This could burn out your compressor. Airmatic leaks are a common failure. Dealers and some indy shops can easily repair. There are also good instructions on GL forums if you want to fix it yourself. Arnott makes compatible parts for the airmatic system and they have a lifetime warranty.
If you want to change the oil yourself, I suggest you buy an oil extractor similar to the following: http://www.amazon.com/Mityvac-7400-Liter-Fluid-Evacuator/dp/B000JFJM14/ref=pd_sbs_sg_4 Then you simply slide the tube into the dip stick pipe, pump the extractor to create a vacuum, and wait for the oil to get sucked out of the engine. Pretty easy.