Thksnow Posted February 20, 2020 Share Posted February 20, 2020 2015 Legacy maintenance schedule shows spark plug replacement at 5 years or 60K. My car is 5 years old but only has 43K miles. It's running fine so is there any reason to change the plugs before 60K? Sent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
apexi Posted February 20, 2020 Share Posted February 20, 2020 (edited) In your shoes I'd wait until 60k, I can't see how time affects plugs. Edited February 20, 2020 by apexi typo Link to comment Share on other sites More sharing options...
ammcinnis Posted February 20, 2020 Share Posted February 20, 2020 The dominant factor in spark plug life is engine hours, which is much more closely correlated with miles traveled than with calendar months. "If you don't know where you're going, any road will take you there." ~ The Cheshire Cat (Alice in Wonderland) Link to comment Share on other sites More sharing options...
YeuEmMaiMai Posted February 20, 2020 Share Posted February 20, 2020 I did mine at 68K in my 14 and they were just fine Link to comment Share on other sites More sharing options...
WILLINH Posted February 20, 2020 Share Posted February 20, 2020 Did mine at 75,000 Link to comment Share on other sites More sharing options...
Grnlantern1 Posted February 20, 2020 Share Posted February 20, 2020 I did my 2015 3.6 at 118k.. I don't drive hard just daily driving and a lot a Freeway mileage.. Car was running great and plugs looked good.. So depends on your deihing style you probably can go to 100k.. Sent from my SM-G965U using Tapatalk Link to comment Share on other sites More sharing options...
waldguy Posted February 20, 2020 Share Posted February 20, 2020 Plugs only need replacing when the arc hits the electrode enough times to erode the electrode past specs. Parked time makes no difference. Keep driving to at least 60K. Link to comment Share on other sites More sharing options...
Thksnow Posted February 20, 2020 Author Share Posted February 20, 2020 Thanks all for your advice. That's what I was thinking too, so I'll wait until at least 60K. Sent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
hkshooter Posted February 20, 2020 Share Posted February 20, 2020 115k and still on my originals. Sent from my SM-G950U using Tapatalk Link to comment Share on other sites More sharing options...
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