8.2 mercruiser

Our SLX 280 today suddenly started making an odd noise. Sounded like knocking at first, but continually grew louder after. See video for reference (I didn’t take the video so don’t blame me for the crappiness plz). The recurring thump is much more noticeable in person than it is in the video...

Looking at a 2000 model year vessel. My broker suggests avoiding the 8.2 due to a variety of issues including a customer that had replacement of both at under 525 hours. A dock friend says his older carbed versions have always used a quart of oil each tank of fuel for the 20 years he has owned...