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You must had a good run then come to a stop suddenly.
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Good point to reinforce there. Warmup and Cooldown are very important if you're stressing the car. All kinds of things can go wrong if you stress a cold car, or if you shut down a very hot car. Most track sessions I warm up the car at idle on the grid *at least* enough to get the water gauge up in a normal-ish range, and then the oil comes up during the warmup lap first session of the day (or it's already pretty warm later). Then I always take a cooldown lap where I try to avoid braking, and keep the engine revs lower while the oil/water temps drop back off. Usually by the time I shut off, water's back down to ~203 and oil's back down to ~210.