i want to just drop the pan and change the filter but what kind of fluid should i put back in it. trying to get it a little cooler o yea its a 99 sunfire with the 4t40e and its run on a half mile track wide open for a 6 lap heat race and a 10 lap feature. I leave it in drive so it does shift down the straights from 2nd to drive. any help would be appreciated