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Maintenance schedule says spark plug replacement is at 70K.
 
I replaced my plugs a little early on my 3.0T T6, right around your mileage. I think mine were due at 70k too. Truth be told I didn’t notice a difference in performance or gas mileage or in any subjective sense. Some of the plugs looked a little more worn than others so it wasn’t a bad idea to replace them on time or a little early.
 
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