perf is related to good flow of air and fuel mix. that is why its behaving like new car.
high reving will move oil fast and with more pressure inside engine, will cause leakage at a weak spot. high revs oil change should be done quick. i never follow what who says when oil should be chnaged, i change oil when i see it dark, means its picked up enough dirt disposits inside engine while keeping engine clean, but it move those disposits inside engine , so lets change it to take out dirt.
have engine checked for oil leaks , could be gasket area too in case it overheated or someone put more oil than F mark to create over oil pressure.
if none... then rings could be weak to push oil into exhaust this require some cylinder sleeve work.
but mech can tell after looking at engine, have a couple of mechs look at it before deciding what to do. - there are additives to thicken oil but that is temporary solution
3rd day oil change is no biggie for a race engine.