Over the years I've noticed when I turn the key on I'll hear a pump running from time to time. Doesn't happen every time I turn the key, probably close to half the time. I've never delved into the workings of the motor since it has been so reliable, I just change the lower unit oil and impeller once a year.
I did have to change the upper oil reservoir when the magnet fell off the float 3 years ago, but that was 35 bucks and 30 minutes of my time, so that was easy. Other than that, not one issue.
"If you think they're going to give you your country back without a fight, you're sadly mistaken." Steve Bannon