I've been racing with E85 for two years now, no milking of the oil I did dyno tune the motor(mainly the jetting) before putting it in the car, my car has a very small cooling system so it runs 180+ on the return roads at our local 1/8 mile track, ir will run over 200 F on the return roads at the 1/4 mile tracks, maybe that is a good thing It does not cool down on the return road like a friend of mine car does who races with E85 also He has a standard radiator and cooling system, mine is tiny Mine does take some time to warm up in the morning and it does cool down quickly once it's shut off