George 8/29/2012

2002 Ford Explorer Sport Trac XL 6Cyl4.0L - Preventive Maintenance

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200,000 miles on original plugs. Still running good . Should I change?

200,000 miles

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  Jimm 8/30/2012

  Yes, go ahead and change the spark plugs. Even if running OK - no noticeable problems, there is risk of the spark plug threads corrosion over time - meaning the spark plug change possibly will involve cylinder head thread repair for damaged threads. Be sure when changing the spark plugs to place a small amount (one-two threads) of anti-sieze on the new spark plug threads.
  
  Try the many on-line auto parts sources, such as; www.RockAuto.com, or www.autopartswarehouse.com for the replacement parts.

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  George 9/5/2012

  Thanks