I just replaced mine with the NGK platinum ones (NGK BKR6EQUIP) as per specifications for the N-62 motor. The OEM bosch plugs I pulled out @ 140,000 kms were a bit sad, but not totally stuffed. Have not noticed any difference in performance or economy (only done 100 kms ago). Changing plugs was not a difficult task at all. I laid out the coils in the order I removed them, so they all went back on the same cylinder. Oh - and by the way, NGK are made in Japan and probably one of the best spark plugs you can get (all my petrol/gas/lpg vehicles, stationary motors and machines have them).
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08/06 build 4.4i Stirling Grey over black
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