Air filter inspection questions
How to do a inspection for your air fiter? I mean not just check if it dirty or not, how can you know if the air filter need to be changed? Because lots of aftermarket air filter can be cleaned and reuse like K&N, I have one, after I clean it I can see lots of little holes under the the light like the picture, I don't know if it is normal and will be OK after I oil it or not.
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