I ran one pass this weekend, no knock, 8 gallons of 116 in the car. That was saturday. Last night I went out to do some general maintenance on the car, and when I pulled the radiator cap, there was oil floating on top of the coolant. It is for sure oil, not rust or dirt. Its slippery and my coolant system was SPOTLESS before saturday. I pulled my dipstick, expecting the worst, but its clean. Car runs the same, no smoke. I am going to drain the oil tonight to check it, but it looks brand new on the dipstick. Plugs look brand new also. I put them in right before the race, so they got one pass and like a few street miles on them. What did I do? Everyone says "don't worry". Bull$*#t. It is wrong. Oil should not be in your radiator. And I don't have my oil cooler in there anymore, so its from the motor. Ideas? Going to do a compression test, too. What should I look for? Thanks!