My guess is crankcase pressure. If you were running it wide open, a lot, the engine runs at high crankcase pressure which can force oil out of the cap, dipstick, and the PCV system. It's REALLY hard to diagnose things like this over the internet. But, if the oil isn't coming out of the filler cap, it's likely the valve cover gasket... assuming what you're seeing is oil and not power steering fluid that boiled over and slung back over top of the fuel rail cover.
Many people who track their cars regularly put a breather cap on in place of the stock filler cap. This allows the crankcase to vent. All states are different, and some states consider that tampering with the EGR system, so if your car is emissions tested, you could use the breather cap at the track and/or replace the OEM cap for emissions tests.
Many people who track their cars regularly put a breather cap on in place of the stock filler cap. This allows the crankcase to vent. All states are different, and some states consider that tampering with the EGR system, so if your car is emissions tested, you could use the breather cap at the track and/or replace the OEM cap for emissions tests.
