Colder spark plugs on 997tt ?
I run on pump gas and car has 20k miles,
By the way, since the car is tuned do i need to change to plugs now?
or do i need to wait for another 10k miles for regular plug change interval ?
By the way, since the car is tuned do i need to change to plugs now?
or do i need to wait for another 10k miles for regular plug change interval ?
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