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An NGK '6' is the standard OEM heat range isn't it. How do they look after 60k km's - a bit worse for wear or pretty good? I was thinking that it might be worth a go going back to standard heat range (I've been a heat range colder since I bought the car) now that water injection is on there, at least for the street. Theoretically the combustion temps should have dropped with it operating.
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