Hm. My oil temp goes up when stuck in traffic on hot days. It'll climb up near 220 but so far never past. I have also noticed the oil temp tends to run higher when I am forced to drive at low speeds (50mph and under) for extended periods. But maybe that's b/c I always drive in full auto and the engine lugs itself around at very low RPMs at low speed.
Back on topic, my fuel gauge tends to jump around too, especially if I've left the car garaged for a week or so.
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