Is your engine on or off? Most of the problems come from EOC - engine off coasting - with an auto tranny. Without the motor spinning with the drivetrain, the oil might not be circulating enough. Half a mile here and there probably won't hurt anything. It's when you get into rolling down mountains at high speed like I do here in Colorado. 15 or 20 miles without the engine on probably wouldn't be good for an auto tranny.
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