After 169,568 miles, time for plugs. Any one else have lots of corroded under hood hardware, fuel rails, etc? Granted, I am in the upper mid-west, the van spent the first part of its life in the Chicago metro and Madison, WI areas. Winter? here's your salt....(or brine) Looks like low quality plating on the hardware..meh. Plug condition was a nice light brown/light gray - clean burn. The gap? Epic. largest measured .116, 'twas time, indeed. New NGK 4469 Iridium IX plugs went in, night and day improvement, my butt-dyno says there are more beans on the fork. Hoping to see a small bump at the gas pump, every bit helps. As for the corrosion, when I finished the plugs, I hosed everything under the hood down with SeaFoam Deep Creep (except the belts and exhaust) hopefully this will keep the oxidation to a slow crawl. Psst, Nissan, use better hardware...