No idea exactly how it relates to a car or light truck, but I use to operate 3 axle 19 ton curb weight trucks designed for seismic surveys for the oil industry. They were equipped with transmission oil temperature gauges (Alison 5 speed automatics). When moving from job site to job site we drove them on the highway (anywhere from 50 - 15000 miles). In cool/cold weather, it would usually take anywhere from 50 - 100 miles for transmission temperature to stabilize at a peak reading.
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