Take off the oil cap,and look in with a flashlight.You will be surprised how much you can see in there.
It isn't as good as taking off the valve cover,but if it is neglected,it will be obvious.
Other wise...popout and rust are the biggest concerns on an NX from my experience.
It isn't as good as taking off the valve cover,but if it is neglected,it will be obvious.
Other wise...popout and rust are the biggest concerns on an NX from my experience.