i just noticed this thread. you should not be going onto any race track with antifreeze in the car. no. dont do that anymore.
as to the oil ive been a royal purple driver fror 5 years now. roush yates recommends 5w30
Havn't been to a car track day yet but iv'e done several motorcycle trackdays and I've always ran distilled water and water wetter. Is that acceptable with cars?