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Thread: Replacing spark plugs?

  1. #1
    Djacobs64 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Nov 2006

    Replacing spark plugs?

    I've got a 2004 V6 AWD SRX with 52,000 miles on it. I get all maintenance done as required and just replaced the tires. What bothers me is the gas mileage. I'm only getting about 12.5 MPG. Granted I live about 5 minutes from work and do mostly in town driving but about 6 months ago I was getting between 17-19 MPG. I'm curious if I should replace the spark plugs even though I've read the OEM ones are good for 100,000 miles.



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  3. #2
    PJ1520 is offline Cadillac Owners Connoisseur
    Automobile(s): 2007 SRX4 N*, 2004 Infinity G35 Coupe
    Join Date
    Feb 2010
    New England

    Re: Replacing spark plugs?

    Not enough info......your climate might help us for starters. Winter gas formulation and longer warm ups. If your climate is like mine, your car wasn't reaching operating temperatures by the time you got to work and shut it down.

    Second, if you used to get 17-19 mpg with cold start ups, five miles to work, and mostly in-town driving, I'd say you used to have the best gas mileagle of any of us. :-)

  4. #3
    jsiddall is offline Cadillac Owners Fanatic
    Automobile(s): 09 SRX V8 AWD Sport, 06 STS V8
    Join Date
    Oct 2009
    Ottawa, Canada

    Re: Replacing spark plugs?

    Ditto. I can't imagine getting 17-19 MPG in town. Heck, my V8 barely gets that on the highway!

    Are you sure you weren't set to metric and reading the numbers in l/100 km? That sounds more like it!

    Regarding your original question, I have never found that plugs cause a change in mileage -- even if replaced at 100,000 mi.


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