oil leak

Hi, Was unplugging my ctek today and thought I'd just run my inspection lamp around the engine bay, seems like a found a very small "leak" near the coolant tank area? I tried to smell it and oddly it didn't smell like oil yet it was yellowish and oil like. I couldn't see a 'drop' from the hose...

Had a blast on track at Thunderhill, will def be making good use of my NASA passport and attend more event. Oh and has anyone else ran out of oil as I did? I'd recommend packing a quart just in case when you go because most gas stations won't carry the spec for our cars