uh oh...think I have gas in my oil

well I was just out changing my oil and I noticed it smelled kinda like gas. I realized that between this oil change and my last I put UV dye in my gas tank, so I busted out the black light. to compare, I looked at some old oil I had laying around still and it glowed kinda blue. then I looked at the oil I just drained and it glowed green (the color the UV dye glows). I'm hoping that different oils just glow different colors (the old oil drain pan had some synthetic blend and also regular dino oil mixed in). but how can I verify whether or not it really is gas in there? and what sort of thing would cause this to happen? thanks for any help guys.

this sucks

well I just checked the compression and everything seems fine. got 160,160,160,162,156,165,167,160. The car generally stalls on the first start of the day, and when it does it reeks of fuel. I get horrible gas mileage (have another thread going on that topic) but my plugs are white. last I checked, my fuel pressure was around 40.