455 Oldsmobile Engine Rebuild: The customer requested partial roller rocker arms to be installed on a Oldsmobile 455 rebuild. The rocker balls were incorrectly sized from the supplier and did not fully seat in the rocker arm. As a result, immediate rocker arm wear resulted in a significant amount of particles generated that were caught by FilterMag. The first filter was changed after only 30 miles, then the rockers were changed. The second filter was changed at 60 miles to replace the break-in oil.