It may be a moot point now. Yesterday a car lost a motor coming out of T8, and punched holes in the oil pan. He didn't put much oil on the track but he pulled into the crossover and parked...and drained about 5 quarts of oil. We didn't realize what was happening under the car so the oil sat there and soaked in for the rest of the session before we moved the car and started cleaning.

My worry at this point is that every day when it gets hot (for a while) we'll have that oil cooking up out of the pavement, and it's in a pretty bad spot (in the line, just before the transition from the crossover to the outside of what is normally turn 13). I'll keep an eye on it.