NGK 93911 LKR7AIX Iridium IX Spark Plug, Pack of 4

These pre-gapped plugs are great for your engine. It took me 1 hour to replace all my old plugs with these new ones in a V-8 Mercedes 550 engine. EASY. The NKG plugs are running smoothly and sometimes, as with these, small things can make a big difference. I had previously installed Bosch, but after 50,000 miles I felt they needed to be changed because I was seeing degradation in my fuel mileage. I will come back and update this review in 5,000 miles to tell you if and when my mileage has improved. I can already see a upgrade in engine performance just going about 10 miles.

Got 8 of these plugs for my 2008 Mercedes S550 4Matic. I noticed an increase in acceleration immediately. I've only had them for a week now, so I can't comment on mileage, value, or longevity. But, they were easy to install. I found the torque settings on the NGK website. You probably won't need anti-seize on the plugs, as they are designed to be used without it. Keep in mind that if you do use anti-seize, that your torque settings could change. Would buy this brand again.

Great NGK plugs for my 2007 Mercedes 2007 Sport Sedan!! Percent fit and literally a fraction of the price when store bought. I bought 4 for $20, and advanced auto sells them for almost $15 a piece

Bought 8 although only need 6 of those. They work pretty good. Side by side comparison shows should have them replaced long time ago.

Product came pre-gapped at the correct specification...my car, a 2007 SL550 was already a very high performing machine but once I installed these, the power came on in a very impressive manner as well as a 20% boost in mileage. If your car doesn't come equipped with Iridium plugs from the factory, you should try these..they definitely work!

You get 1 plug not a pack of 4. Returned and concerned. The only thing I got going for me is the package it came it was much to small to fit 8 plugs. UPDATE: Returned, refunded, then later charged back... No option to call or complain...

it is 12*19,16mm in size for regular Mercedes plug . not short one as the picture on website. it look pretty well-made iridium plug I guess. good product with good price.

The sparkplugs are great when gapped properly, which brings me to the point that this seller should NOT advertise as pregapped plugs. If they would've just advertised as sparkplugs, this would have been a 5 star review. I'm happy with the purchase other than the misfiring and false advertising.

Work as needed. great price and no issues with firing.

Great, quick!

Clearly states pack of 4 spark plugs. Only 1 was delivered.

Arrived overnight

bought two boxes, site said they were pre-gapped but i always check anyway. 1 box was spot on, the other was off a lot! otherwise great product and fast delivery