I have a Speedaire model 5Z185B air compressor(model #on the pump itself is 2Z499C. I need to know what type of oil to use for an oil change.

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Hi Perry and thanks for writing in.
It were me particularly if, like the photo of one, my compressor was way out of warranty I’d just visit the local compressor shop and pick up enough of their compressor-rated oil for the job.
Just make sure it’s compressor lubricating oil and not an oil for other purposes.
On the other hand, if you want specific brand advice (particularly if the compressor is still under warranty) visit the Speedaire page on this site, and follow the guidelines to find your closest Speedaire depot. Give them a shout. They’ll give you specific advice.