"rolls eye's" The computer in our cars today, re-calibrates every time we start the dam thing. The sensors that monitor everything determines when and how the maintenance minder pops.
syntec full syn, change every 8k kms. by that time it is just starting to degrade. anyone that knows anything about oil can tell just by putting it on your finger from the dip stick.
Air filters, stock, you can change every 15k kms no prob. i check it every oil change. just did last oil change yesterday at 108k kms, 2009 Civic SI Coupe. My air filter has been in for the last 16k kms and looks almost like new.
Had K&N, pointless and useless. Waste of money in my opinion. I did comparison between K&N and stock, stock lasted longer, and gave the same dam performance as the K&N. so, don't waste your money.