As promised, I just checked the oil dipstick/tube on my 97 camry le 4 cylinder engine. Although there is definitely air continually blowing out of the tube, while the engine is running, there is no sign of oil coming out of the tube. I ran the engine for five minutes and there was no change. I accelerated the engine and there was no change.
You may want to double-check the oil level, just to rule out the remote possibility that there is so much oil in the engine that it is getting blown out of the dipstick tube. You have probably already done this.