My 320 started eating pin plugs. I replaced and re-ringed at 100 hours. Currently have 650 hours with no issues on my engine. Fine alum particles are not serious risk when floating around in the oil stream. First, the filter will catch most of it and any that make it to bearing surfaces will create no damage to steel parts and only limited damage to bearing surfaces. Even if they embed in the bearing, it shouldn't damage the steel surfaces (Al is much softer than steel). The key problem area is the oil cooler, as oil flows through the cooler before the oil filter and will catch and trap small particles potentially clogging it or reducing flow.
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 03-09-2020 at 09:15 AM.