NGK (6481) ILFR6B Spark Plug, Pack of 1

I installed this plug in my 2003 Subaru Outback H6 at 102,000 miles. I purchased the car at 89,000 with very few records, but I'm pretty sure the original platinum plugs were unchanged judging from the wear on the electrode and the cleanliness of the red plug boots when they came out (I got dirt and grease on them during install and had to wipe them several times). I immediately noticed significant power increases (compared to the overused platinums) and am enjoying driving my Subaru very much now. One thing to note; these are not the correct plugs for a 2003 H6. They are gapped for the 2005 and up at 0.030 inch. My car calls for 0.039 to 0.043 and NGK recommends a maximum gap correction of 0.008 because of the ground electrode becoming misaligned. The 0.030 gap however was somewhat pinched and when I gapped them out to 0.038 +/- 0.001 the ground actually lined up better and directly over the center of the tip. So far, I am very pleased with my selection and would recommend...Read more

I'm not a professional mechanic or anything, but I recently installed these for the first time on my STi and about 3 1/2 hours later my engine was rumbling in excellent condition. No check engine light, no problems when idle or when driving in low or full throttle. Overall, I am satisfied with my work and the product. The shipping was quick (the product arrived in 2 days) and they arrived in great condition, no damage was done the spark plugs throughout the delivery.

A Sparkplug is a sparkplug, but I am offended about Amazon's misleading advertising. If I had known that the free postage offer would not be honoured, I would have examined the other offers much more carefully, and probably made a different decision!
PeterB