Volvo brand plugs seem to last a long, long time, but they cost a lot. Champions are cheap and last at least 12K miles.
I realize it is not easy to check plugs these days, the coil has to be removed. But if you got new plugs at a dealer, then they will be Volvo branded. Go ahead and pull one when it gets cooler outside. Then you can check the gap and condition. 65K miles is a long time for them to be in the engine.
When installing plugs, I always dab a small amount of anti sieze on the threads.
Klaus
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