2005 Cadillac DeVille Q&A

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

Have not change my plugs in over 80K miles. Running fine. Just wondering -
Answer 1
they claim 100k miles but i think its about time for yours as preventitive maint -
Comment 1
Thank you. -
Answer 2
on your car...100000 mi -
Comment 1
Thank you. How much is the usual charge, if go to Cadillac dealer? Want some idea of the charges. -