What engine oil ?
I use 5w20 Mobil 1 and change it every 5,000 miles. I also use a K&N air filter and
always use K&N oil filters too.
Are you aware that the K&N air filter might be letting in more dirt because it depends on the oil to remove it not the density of the media? There have been reports of damage to the air flow sensor from the oil that they require the filter uses.
Any 5W-20 is fine. Mobil 1 every 5K is more than adequate. Mark is right about the K&N, no added benefit.
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