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You can do plugs anytime without removing the valve cover.
They are accessible under the trim cover.
But, if they have never been done; absolutely change them.
At the very least pop one out and have a look.
At that mileage I'm surprised that coil packs haven't also started to go.
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'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
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