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2012 GMC Terrian 2.4L Ecotec LEA 125k Miles
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87 Posts
My opinion I don't think there is much carbon build up. I did a spark plug change in 2020 and took a picture.

Household hardware Gas Auto part Cylinder Electric blue

Household hardware Auto part Spark plug Metal Engineering
 

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2012 GMC Terrian 2.4L Ecotec LEA 125k Miles
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87 Posts
Since the factory recommended interval is 97,500mi. they really don't look that bad.
My cam shaft positioner went bad about that time. My car would stumble on acceleration and stall at red lights. That's when I got proactive and changed the plugs at the same time as the positioner.

I took my car to my independent shop after that for the big maintenance period which I think is the 97500.
 
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