Mechanics

SPARK PLUG CHANGES

2003 GMC Yukon

Engine Performance problem
2003 GMC Yukon V8 Two Wheel Drive Automatic 110000 miles

Do these high performance plugs, guaranteed for 100000 miles, need to be changed then or how much longer can one go?
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Rlsharpe
July 22, 2008.




They can easily go over that, really depends on how your driving, or if your maintained the vehicle

should go over 100k but I would change them as when they get there, they are not as efficent as they used to be, and you will want the most efficent engine possible.

Blackop555
Jul 22, 2008.


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