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I change yearly but, I track 6-8 road courses a year and it gets hot here. If yours has not been changed yet, I’d do it now. How often depends on how much you race. You have a diff cooler so you can run yours longer. If you race often like I try to do, yearly is a safety precaution. I change coolant yearly, trans 5k-10k miles (I’m a auto), oil until about 30% life left (I do have blackstone reports for diff, trans, and engine oil — which helps me decide when to change).
-Don
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