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Because of age only on the wires, I would replace them. While they are off, do the plugs too, but that is me.
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It's extra work, but pull the wheel and fender liner. Then you get excellent access to the #8 plug, not to mention the others on that side.
I knew this was going to happen. I mentioned the wires because, IMO, they take more abuse than the plugs. They are exposed to all the elements and the constant hot/cold under the hood. They are also 10 years old. I did recommend them, only if thinking about it and do the plugs while in there but if all is running fine now, then don't give it a second thought.I would wait until closer to 90k. If the engine is healthy (not burning oil). They should last the full 95k interval - see my posts with pics on my plugs (I show both sets from 2 changes):
Replaced plugs and wires at 76k - 2015 Denali
Hello Sharing pics of plugs at 76k. Changed wires as well. Manual states 97,500 miles to do this, but I tend to do routine maintenance early, since I don’t drive in ideal conditions. Waiting until 100k might also make it hard to get plugs out... They look great. Probably no issues going...
Right now I have 212K miles on my 2016 Tahoe. Still had the original plugs and wirers until today. I had to change the Purge Valve this afternoon as it threw the check engine light on. I also changed out the plugs and wires and filters. If I was not going to NYC July 4th weekend for 2 months I would have left the plugs in it. Used all a/c Delco parts.
