.......when thrashing a car on track?

The car will not leak at all on the road no matter how much abuse you throw at it

After 20 mins on track my fiesta rs1800 was pissing oil out but now it wont do it at all on the roads etc

Had it at a mates garage on ramps,tried thrashing it etc and looking at it but there is no sign of where its coming from

Could it be the oil getting to hot thats causing it?