+1 I keep meticulous records of everything I've done. The only thing is most of it gets done at the Nissan dealership since the closest Infiniti is over two hours away. Now when I move later this year I'll be much closer and it will be taken to the Infiniti dealer.

 

Thanks, I should have been specific I meant OIL filters, their air filters are fine. K&N are freer flowing but not much better than 95% effective when clean, most paper filters are "better" at filtration, it's a tradeoff between flow and effectiveness. K&N gets more effective once it builds up a little dirt.