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IamLegend:
I was referring in gemneral to air intake systems, not just the Legend. To gain more insight into this you will need to look at used oil analysis results with the various air filters. You are going to be looking for increased levels of silicon (not silicone) in the oil. Silicon is a component of sand and dirt. The oiled gauze filters allow high amounts of silicon to pass through them. The silicon is abrasive inside your motor.
Dave
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