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I have seen teps of 270-280f at the track with an OEM cooler, turning the heater on and removing the plastic underbelly trey helps. You can also drive faster for more air flow ;-)
Synthetic oils can take that temp, I just change my oil often during the track season, it cost less than $50 to do an oil change so dont be a cheap ass. Basically every track day i run about 2hrs at high temps so i figure after ever 2-3 track days change the oil.
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