how often do I need to tuneup or replace spark plugs? on 2005 Cadillac DeVille

Have not change my plugs in over 80K miles. Running fine. Just wondering

by in Washington, UT on November 08, 2012
2 answers 2 comments
ANSWER by on November 08, 2012
they claim 100k miles but i think its about time for yours as preventitive maint
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COMMENT by on November 09, 2012
Thank you.
ANSWER by on November 08, 2012
on your car...100000 mi
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COMMENT by on November 09, 2012
Thank you. How much is the usual charge, if go to Cadillac dealer? Want some idea of the charges.