Originally Posted By: WiredForStereo
I wish I could find something with better than a 29 micron rating.
I used to think that way too. Any filter is a huge step up from none.
My aircraft, a Cessna Cardinal 177RG has a Lycoming IO-360, 200HP engine without any form of filter. It's first run lasted nearly 40 years and made it well past the overhaul period. After disassembly, there was little wear on the parts. Yes, the camshaft rusted out and failed. That has nothing to do with a filter.
Yes, the engine now has a standard CH43109 full flow filter.
My point, any filter, regardless of micron rating is helpful. But, it won't necessarily result in longer engine life.