Non ferrous is not coming from the IMSB. So, the sky is not falling, or, you may not have enough information to determine if it is falling. But, you have something going on.
Agree with getting a spin on non-bypass type filter and filter mag. Anything circulating gets caught on the first pass. Debris can't do any more damage once captured and you can analyze it better.
I had a failing IMSB in mine. Fixed that and installed a spin on filter and mag. I changed the filter and oil after 500 miles. Then changed the filter after 1000 miles, 3000 miles and 5000 miles when I changed the oil again. I now have 10,000 miles on it. Changing the filter this weekend just to see what might be there.
BTW, the filter is $4.50 and you need half a quart of oil to change the filter between oil changes. Also, I did some investigation into the best type of filter. Good old paper has finer media and will allow less through. The filter mag is to capture any ferrous flour that would pass through a filter. Extended life filters have more porous media but can hold more garbage. So, go with paper and change them more often!
Also, find a new shop! They are either incompetent or they like to sell new engines to people who may not need them.
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