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I don't think you'd have a problem with excessive heat soaking into the bearing area in start/stop situations with well designed water cooled turbos. Hard load pulls of longer duration followed by shutdown might be of concern if you didn't have water there in a 1600-1800F environment. Even 10 seconds of idle circulation would mitigate that a bunch. I wonder if they have previsions to continue to circulate water and/or oil after shutoff since the trend is to move the accessories off of the engine and using ECU controlled electric motors.
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