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Oil cooler 100%. Even with a larger than DO88 oil cooler (Litchfield race cooler) I can only run 5-6 laps at Laguna before getting to 280-290f oil temp, and the water temp warning comes up. At thunderhill and BW though, I have no issues. I am planning to run a set of center racelouvers and see how much that helps.
EDIT: Also running the Epic oil diverter valve, 95% water/water wetter, 5% coolant, Motul 10w60, catless, still runs hot at Laguna.
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