I have read the owners manual several times... What the manual doesn't give is the collective experience and advice of fellow Xterra owners whose vehicles travel the broad spectrum of America and Canada. So my question was directed at those that may feel it's best to change the plugs at 60k regardless what the manual says based on their past and present experiences.

I like to keep my X in great running shape and if the putting new plugs in at 60k makes life better on the X then I'll spend $7 bucks a pop for new NGK's.

VOTE FOR A DEMOCRAT!