Recently, my 2021 Z3 (indmar 400) is running hot. At idle, 160-165. Once I start to cruise, 3-5 minutes at 4000RPM, temp climbs to 180-190. It drops pretty rapidly once I return to idle. Running temp up to a month ago, was 160-173...even when surfing. Impeller has less than 20 hours on it. Before I drag it out of the slip to the dealer, what should I be checking? Appreciate any and all suggestions...I hate downtime.
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