Question about 2003 Chevrolet Impala
The average suggested time is 100,000 miles. the plugs are designed to go this long. If you check your manual it may also recommend replacing the oxygen sensors about the same time to ensure the maximun fuel economy & make sure you don't have Check engine lights coming on in the near future.
Hope this helps
Posted on Jul 20, 2009
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Posted on Jan 02, 2017
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