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the rear passenger wheel well is near your oil fill tube - an item which often cracks (one end attached to the body, the other attached to the engine, add a lot of independent movement of each end at your last track day, some brittle old plastic, and possibly increased suction due to a failing aos and you get a bad oil fill tube). with a bad oil fill tube you may not notice it 99% of the time, but start chucking your car through the track, get the oil sloshing and it'll splash out. it'll then get on other components and cook, perhaps pool in the tray under your engine, pick up all the old brake fluid, coolant, transmission fluid and road crud and get it cooking, etc.
also check your cv boots, a bad passenger side cv boot will splash grease all over the wheel well and stink. a day at the track will work them especially hard, and if you have a car with a 6-speed, that transmission is longer resulting in a bigger transmission flange/wheel hub offset and increased chance of cv boot failure.
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