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Just wondering about something: Does the prius use an electric oil-pump, so that the engine maintains oil pressure while the ICE isn't running, or does it use a mechanical pump (like most/all vehicles I know of)? My guess is that Toyota did this right and that the Prius has an electric oil pump or some other method to ensure proper lubrication while the ICE is off, such as when stopped in traffic. Otherwise we're going to see some significant engine wear... Anyone know?