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NGK (4904) ILFR6T11 Laser Iridium Spark Plug, Pack of 1

4.5 4.5 out of 5 stars 70 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Automotive Replacement Spark Plugs by NGK
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Purchase options and add-ons

Brand NGK
Core Material Iridium
Top Material Type Metal

About this item

  • Laser welded iridium center electrode tip ensures high durability and greater spark
  • Platinum disc welded to backside of ground electrode provides long life
  • Longer insulator nose prevents fouling, corrugated ribs on insulator prevents flashover, and the triple gasket seal eliminates combustion gas leakage
  • Faster starts and quicker acceleration
  • Better fuel economy and lower emissions, trivalent metal plating for superior anti-corrosion and anti-seizing

Frequently bought together

NGK (4904) ILFR6T11 Laser Iridium Spark Plug, Pack of 1
$10.22
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LEXIVON 5/8" Swivel Magnetic Spark Plug Socket, 3/8" Drive x 10" Total Length | Enhanced Magnetic Design with Thin Wall Socke
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 4.35 x 2.24 x 2.08 inches; 1.59 ounces
  • Item model number ‏ : ‎ ILFR6T11
  • Date First Available ‏ : ‎ January 2, 2007
  • Manufacturer ‏ : ‎ NGK
  • ASIN ‏ : ‎ B001MU29LA
  • Country of Origin ‏ : ‎ Japan
  • Customer Reviews:
    4.5 4.5 out of 5 stars 70 ratings

Product Description

Laser Iridium Spark Plugs provide superior ignitability and long service life. Smallest tip diameter available iridium/platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions. Laser welded Iridium center electrode tip ensures high durability and greater spark. Platinum disc welded to backside of ground electrode provides long life. Longer insulator nose prevents fouling, corrugated ribs on insulator prevents flashover, and the triple gasket seal eliminates combustion gas leakage. Faster starts and quicker acceleration. Better fuel economy and lower emissions, trivalent metal plating for superior anti-corrosion and anti-seizing.

Top Brand: NGK

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100K+ customers rate items from this brand highly
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Customer reviews

4.5 out of 5 stars
4.5 out of 5
70 global ratings

Customers say

Customers like the quality, smoothness, and value of the spark plugs. They mention that they're the best on the market, they work great, and are worth the price.

AI-generated from the text of customer reviews

15 customers mention15 positive0 negative

Customers are satisfied with the quality of the spark plugs. They mention that they are the best on the market, work great, and are the most durable on the marketplace. Some customers also say that these are the only iridium spark plug on the markets.

"These plugs are great! They're pre-gapped... just screw them in and forget about them for 100,000 miles.Put these in my 2015 Tacoma 4.0L V6...." Read more

"These spark plugs work great in my V6 Toyota Tacoma. I had a smoother running engine and better gas mileage...." Read more

"NGK is the best plug on the market. I have used them for years. I used this on my 08 Tundra, and they perform as I expected...." Read more

"excellent product and ready to work, thank you" Read more

7 customers mention7 positive0 negative

Customers are satisfied with the smoothness of the spark plug. They mention that it has a smoother running engine, better gas mileage, and acceleration from stop is smoother. Some say that it's smoother around town and quicker startup compared to copper plugs at 30k.

"...Acceleration from stop is smoother and more powerful..." Read more

"These spark plugs work great in my V6 Toyota Tacoma. I had a smoother running engine and better gas mileage...." Read more

"Upgraded the stock copper plugs in my V6 Tacoma. Smoother around town and quicker startup compared to copper plugs at 30k...." Read more

"...Only been a couple of days but running smooth so far." Read more

5 customers mention5 positive0 negative

Customers are satisfied with the value of the spark plug. They mention that the service interval alone is worth the price, and it is the best spark plug for the money.

"...47,000 miles on odometer, the long service interval alone is worth the price...." Read more

"Perfect fit, great value" Read more

"Great plugs and a good price compared to many other company's." Read more

"Best spark plugs for the money...." Read more

Top reviews from the United States

MrB811
5.0 out of 5 stars Better torque at lower rpm
Reviewed in the United States on January 17, 2018
Verified Purchase
These plugs are great! They're pre-gapped... just screw them in and forget about them for 100,000 miles.
Put these in my 2015 Tacoma 4.0L V6. Subtle but definite improvement from the stock plugs with 30K miles on them. I have the 6sp manual and its easier to start out in 2nd gear with no engine bucking/lugging and the acceleration from stop lights feels a little peppier.

As a side note... I also put NGK Laser Iridium plugs in my 4cyl 1250 Bandit motorcycle with the same results. The bike is already a torque monster, but just putting in these plugs the bike can cruise 300-400 rpm lower before the hint of lugging shows up. Acceleration from stop is smoother and more powerful

YouTube has videos from Cycle Solutions where they dyno test Harleys comparing new factory plugs with new laser iridium plugs and hp and torque go up.

How? Compressed air is actually and insulator. As the pressure in the combustion chamber increases, the electrical resistance between the spark plug gap increases. The spark will form and punch through that insulation faster from a fine-wire type spark plug - which is the laser iridium design (fine wire type also used on aviation plugs). The spark forms faster because of the fine-wire design and using iridium makes it last a long time. On a dyno chart, this results in your torque curve starting about 300-400 sooner and hanging on just a little bit longer at the high end. Depending on the tuning of your engine it may indicate a few more horsepower. But where you feel it is accelerating from stop where the engine can get into its torque curve sooner.
2 people found this helpful
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JohnG
5.0 out of 5 stars Improved performance and gas mileage.
Reviewed in the United States on January 28, 2018
Verified Purchase
These spark plugs work great in my V6 Toyota Tacoma. I had a smoother running engine and better gas mileage. In my opinion, the laser cut plugs give better combustion because the point is smaller and the spark is more accessible. Iridium plugs last a long time without wearing out (usually about 100,000 miles)
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drock
5.0 out of 5 stars Legit
Reviewed in the United States on February 12, 2023
Verified Purchase
I was worried about ordering these rather than buying guaranteed genuine from the store but I made sure Amazon was the seller and I got authentic NGK plugs. I did have to adjust the gap cause my gauge showed them at.41 instead of .44 but since I couldn't find my feeler gauges I had to use a coin gauge which makes me very cautious with these fine tips. Anyway they were genuine and so far I've ran em just over 1k miles without issue.
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Kevin F
5.0 out of 5 stars Best plug on the market.
Reviewed in the United States on September 12, 2016
Verified Purchase
NGK is the best plug on the market. I have used them for years. I used this on my 08 Tundra, and they perform as I expected. The construction and quality is awesome, they foul less often than competitors. Easy to install, pre-gaped. Testing my plugs, all were gaped perfectly. Non of the gaps needed to be reset. I will use these plugs in every vehicle I do replacements in.
One person found this helpful
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Jane Chen
5.0 out of 5 stars I am happy
Reviewed in the United States on December 16, 2011
Verified Purchase
I just bought six for my 2005 Toyota 4Runner SR5 V6. No limit was encountered - a strange notion to start with. Although we have not experienced any significant improvement, 47,000 miles on odometer, the long service interval alone is worth the price. Also, three of the six plugs are found in not-so-easy to reach locations; here is the link one may able to utilize:[...]. Do it yourself, save money, and thank Amazon!
4 people found this helpful
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D.J.
4.0 out of 5 stars Good plugs I guess?
Reviewed in the United States on June 2, 2018
Verified Purchase
I only bought these because the cost was only a bit more than OEM. 4.0L Tacoma engine seemed to run smoother, but probably only because the factory plugs had 45k min on them. I tend to think the power or torque benefits might be a placebo effect with just having new plugs. I feel these plugs are only more money for their longevity, and not a performance gain. For that alone, they're probably worth it. Time will tell.
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eduardo ibarra
5.0 out of 5 stars Original product
Reviewed in the United States on March 14, 2020
Verified Purchase
excellent product and ready to work, thank you
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Amazon Customer
1.0 out of 5 stars I'm sure these are great plugs in the correct vehicle but this listing needs ...
Reviewed in the United States on August 6, 2016
Verified Purchase
I had my head gaskets replaced in August 2015. I bought these plugs in December 2015. The head gaskets failed in June 2016. I thought they would be replaced under warranty. My mechanic informed me that these are too long for a 2006 Subaru Outback and likely damaged the head gasket's fire rings. I have the gaskets and they do look fried. I'm not a mechanic so I have no idea if plugs can cause this type of damage or if the job was done incorrectly. Unfortunately, he was able to use these plugs as an excuse to void the warranty. I had to pay out $800.00 to replace the head gaskets a second time less than a year after the first. I selected the correct year, make, model and engine when I bought these. The only iridium plugs on NGK's website for a 2006 Outback are BKR5EIX-11. Regardless of the vehicle you own please check the manufacturer's website whether it's plugs, water pump, etc. before relying on the information on Amazon. I'm sure these are great plugs in the correct vehicle but this listing needs to be corrected before other customers run into the same issue.
One person found this helpful
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