Q: I have a 2007 Nissan Frontier that I bought 1 1/2 years ago.
A: Frontier 4 Cyl K&N does not have a cold air intake. V-6 systems will not void the warranty however if you allow K&N oil to get onto the air flow meter Nissan might not warranty that part. Buy two Cone air filters so you dont have to replace a filter with one dripping with oil allow your clean freshly oiled filter to sit at least one day before reinstalling so excess oil can run out.