I got my F6B 2 years ago with ~6k miles and decided to go through it and do all the maintenance since it was 3 years old when I got it. I researched and bought Denso Iridium Plugs on eBay. They arrived and were a Chinese knock off that weren’t even close to Denso in packaging nor product. Returned them and bought another set off eBay from a different seller. They arrived in proper looking packaging but the plug quality of fit and finish were poor. The plugs varied too much from one to another to feel confident so I returned those too. Bought NGK V Power from a vender of a GW forum when I bought other maintenance items. So I put them in back then and the OEM plug inside was a Denso U Groove and they looked very good - quality and wear wise. Well I pulled them out and replaced them today. I purchased Denso Iridium Long Life plugs after looking at them and the Denso Iridium Power plugs at my local Napa Auto Parts store. The plugs looked great quality wise. I am now 100% sure the sets I received on eBay were fake. I went with the OEM auto manufacturer Long Life Iridium plug because the electrode was more robust in size and because of the longevity. The Denso Iridium Power Plug longevity is ~ 9k to 12k miles according to their documents. Don’t get me wrong. Plug changes are easy on the GW but such a short longevity gives me pause on their durability. I did learn that I prefer Denso over NGK and that I will now buy local after inspecting the parts. Very pleased now but I look back and laugh at my experience.
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