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E3

E3 Spark Plugs E3.68 Premium Automotive Spark Plug with DiamondFIRE Technology for Hemi Engines, 14mm, 1.000" Reach, Gasket Seat, Pack of 1

  • Based on 432 reviews
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Availability: In Stock.
Fulfilled by NorthEast Cycle Shop

Arrives Monday, Dec 22
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Features

  • FOR DOMESTIC APPLICATIONS: Designed to fit a wide range of domestic vehicles, this spark plug enhances power, improves fuel economy, and reduces harmful hydrocarbon emissions, making it ideal for various engine types and models
  • DIAMONDFIRE TECHNOLOGY: Patented side-wire electrode design ensures faster, more complete combustion, optimizing engine efficiency, improving power output, and reducing harmful emissions
  • MORE POWER AND FUEL EFFICIENCY: E3 Spark Plugs deliver up to 12% more power and up to 13% better fuel economy in small engines, and up mid-single digits on automotive applications, helping to enhance overall engine performance and reduce fuel consumption across a wide range of vehicles
  • LOWER EMISSIONS: The more complete burn helps to reduce emissions, minimize carbon buildup, promote cleaner combustion, and support compliance with modern environmental and emissions standards
  • LONG-LASTING PERFORMANCE: Built with Yttrium-enhanced alloy for durability and pre-ignition prevention; backed by a 5-year/100,000-mile limited warranty for reliable, extended use without frequent replacements

Description

The E3.68 automotive spark plug is a high-performance solution designed to fit a wide range of late-model applications, particularly Hemi engines. With a 14mm thread diameter and 1.000-inch reach, this spark plug features a gasket seat and is widely available in automotive retail stores. E3’s patented DiamondFIRE side wire is securely fastened to the shell using a three-leg design, which allows for excellent heat transfer and creates more turbulence in the combustion chamber. This innovative design results in a more complete fuel burn, leading to increased power, better fuel efficiency, and reduced hydrocarbon emissions during long-term use. Includes a unique ground electrode and full-size center electrode, offering optimal performance for up to five years or 100,000 miles. The DiamondFIRE open design creates the preferred edge-to-edge spark path, replenishing the spark zone with fresh fuel/air charge and directly exposing the flame front to the piston head, resulting in improved engine power, reduced fuel consumption, and decreased carbon monoxide emissions. This spark plug design has been proven to extend the life of the spark plug while offering faster, smoother acceleration for a more efficient engine operation.

Brand: E3


Core Material: Copper


Thread Size: 14mm


Top Material Type: Alloy Steel


Vehicle Service Type: Car


Brand: ‎E3


Core Material: ‎Copper


Thread Size: ‎14mm


Top Material Type: ‎Alloy Steel


Vehicle Service Type: ‎Car


Global Trade Identification Number: ‎88


Automotive Fit Type: ‎Vehicle Specific Fit


UPC: ‎894489000688


OEM Part Number: ‎E3.68


Manufacturer: ‎E3 Spark Plugs


Model: ‎E3.68


Item Weight: ‎1.6 ounces


Product Dimensions: ‎6.55 x 1.65 x 1.45 inches


Item model number: ‎E3.68


Is Discontinued By Manufacturer: ‎No


Manufacturer Part Number: ‎E3.68


Date First Available: January 2, 2007


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Dec 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • It’s a spark plug
Works as it’s supposed to
Reviewed in the United States on August 15, 2025 by Gary Karnik

  • Try em you’ll like em! Works for me!
Maybe I really Want to feel an improvement in performance in my older Honda, so I do. To me, there is more consistent pull when getting on the highway now. Maybe because the other plugs were worn out? Anyhow, I bought a set for our Toyota too and both seem to be better performing.
Reviewed in the United States on July 3, 2025 by zanzarista

  • Great OEM substitute
I haven been aware of this new design for some time now through YouTube and E3's own website and have been curious about using these plugs. Since there are no E3 retailers in New Zealand that I'm aware of, I'm glad to find them through Amazon. I used these plugs in a 05 Mercedes C180 Kompressor as a OEM equivalent as per E3's online catalog. They were as simple to install as regular spark plugs. No gapping required with the electrode design. They were significantly cheaper than the OEM NGK platinum plugs at only a fraction of the cost, even when i include shipping. I've driven for 2,000kms on the E3's now and they perform just like the OEM plugs. Whether they produce more power or save fuel I cannot be certain but I'm more than satisfied that they saved me the purchase price of the very expensive OEM plugs. I hope they will continue to perform with a similar durability and service life and I guess with that time will tell but so far so good. ... show more
Reviewed in the United States on January 14, 2014 by Stan

  • Exact fit.
Fixed my misfire issue and made my engine run smoother. Restored lost power as well. Highly recommend.
Reviewed in the United States on May 4, 2025 by J W

  • No power gains but work well
I didn’t get any power increase or better gas mileage; however, I did get some very nice spark plugs that work well. The price was excellent and I would buy them again.
Reviewed in the United States on May 31, 2019 by Mike A

  • Increased Gas Mileage
Actually increased the gas mileage in my Rav 4
Reviewed in the United States on February 28, 2025 by Jackson

  • 3.5 v6 Tacoma
Compatible with the 3.5 v6 Tacoma so I installed them. Later learned in the service manual to use ONLY IRIDIUM Plugs. These sicken the engine ,.... .rough idle, poor acceleration, felt a miss occasionally, lost some hp/mpg. Purchased Denso IKBH20TT plugs which fixed everything. Worse part, installing plugs in the Taco is grueling but do it twice is torture.( the design of the E3s are archaic, like arming WW2 soldiers with flint locks rifles.) Install the E3 plugs if you insist on ruining your engine. ... show more
Reviewed in the United States on May 17, 2024 by Bo

  • Amazon did not package the product properly!
Very Very bad packaging !!! The plugs were thrown into a shipping envelope in their original cardboard box. Each plug in it's own little box! When I received the package and opened it 5 of the 8 plugs were out of their box and loose in the envelope. Problem is although they look OK, no porceline cracks I will not know if they are good until I install them. Good job Amazon. I've used E3 plugs in the past and found them above and beyond other brands. ... show more
Reviewed in the United States on March 1, 2023 by Bob Schmidt

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