I know this thread is a few years old*, but people search these old threads for reference, so I think it's important to keep them accurate.
Brandy, you are not to blame in the least. Your advice would be absolutely dead-on if the information on searspartsdirect.com were accurate, but I'm afraid they lied to you (and to all of us).
The 919.175960 IS NOT AN OIL-LESS COMPRESSOR! (Sorry for shouting, but readers need to notice that, or they'll wreck their compressors pretty quickly.) In fact, it has a fairly conspicuous oil drain spout at the bottom of the pump, but of course, not everyone knows to look for one.
You really do need to change the oil in a 919-1... oh, let's just call it a 960. The manual for this unit, for some reason, is really hard to find on the web (without paying, anyway), but fear not: Here's what's presented as a generic guide to maintaining an oiled compressor, but the unit they use in the illustrations is nearly identical to a 960. It's either a Craftsman or an equivalent DeVilbiss (they've debadged the unit for the photos), with a slightly smaller tank (I think) than a 960. These instructions are absolutely correct for the 960.
Following the instructions given on searspartsdirect.com will kill your compressor before long. (I've emailed them. Let's see if they fix it.)
*That's appropriate; so is this compressor, and so am I. :)