Are Oil Free Air Compressors REALLY Oil Free?

"Oil free" when speaking of compressors doesn't mean they don't have oil. It means they are not servicable. In other words, they are permanently sealed. If oil came out of that compressor, then either is is cracked or broken somewhere, or it was on its side a vary long time. Long enough for the oil to perhaps run out of the air intake. I am not sure you can add oil back to one of those. I generally stay away from those unless like my little portable pancake compressor for like my nail guns and such. They are great in that application, but oiless compressors much larger than that are not for any sort of heavy duty use at all. Opinions vary, but that's mine.