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Same goes for Iridium plugs, usually many times the cost of the standard version and while they are capable of lasting longer, it's still usually cheaper to run standard plugs and change them more often.
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Agreed. Buy right and five NGK on eBay, cost a tenner a set delivered. At that price, who would care? I run them to over 25K, but reallly I should change more.
As I said, on CNG set to 0.7mm, mine doesn't like 0.8mm, my coils might be getting tired. On 0.8mm it runs fluffy under load.
Petrol is 0.8mm stock, but petrol isn't that fussy.