Free Agent Posted August 26, 2009 Share Posted August 26, 2009 I just changed the plugs in our 8.1 at 101.000 miles. Wow what a difference. Peppier and much smoother running. Perhaps should have changed them at 75K. I mention that if you're thinking about it seems like a good idea. Out Toyota requires them changed every 30K, the GMC book says 100K. Quote Link to comment Share on other sites More sharing options...
Jakster884 Posted August 26, 2009 Share Posted August 26, 2009 (edited) Most newer cars recommend every 100K. The only problem is taking them out over that period of time. Sometimes it not too easy. I would never go past 50K... Edited August 26, 2009 by Jakster884 Quote Link to comment Share on other sites More sharing options...
White Rhino Posted August 26, 2009 Share Posted August 26, 2009 man that still amazes me! I remember when I had my 70 Challenger in high school I had to pull and clean and or replace them about every 3 months... course I think I just liked to tinker and I rode it hard..... Quote Link to comment Share on other sites More sharing options...
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