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2 possibilities come to mind, 1 is the fuel pump could be overpressurizing and forcing gas into the oil. 2 is your head gaskets.
What it boils down to is, if the oil smells like it has fuel in it, it probably does. That is going to be extremely hard on bearings, so at the very least you'll want to change it ASAP. Synthetic oil or K&N filter are not the cause, nor could anyone ever logically justify any way they could be. My only beefs with those are, synthetic oil is completely unnecessary in non-racing applications, and K&N filters only flow better by filtering less. Neither of those can be the issue you are having.
What it boils down to is, if the oil smells like it has fuel in it, it probably does. That is going to be extremely hard on bearings, so at the very least you'll want to change it ASAP. Synthetic oil or K&N filter are not the cause, nor could anyone ever logically justify any way they could be. My only beefs with those are, synthetic oil is completely unnecessary in non-racing applications, and K&N filters only flow better by filtering less. Neither of those can be the issue you are having.
