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Pugs and Wires


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Hi Everyone, I have a 99 Deville, 56,500 miles when do I need to change out the plugs and wires? I do both city and highway driving- getting about 18/25 mpg. I only put in 93 octane gas and do a few WOT's every so often (no smoke out the tail pipe). Over all the car runs great and no codes. Thanks foe any comments. Craig.

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For spark plugs it's 100K. The wires just need to be inspected - if they are not arcing, they are fine.

'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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