Advertising Disclosure Iridium Spark Plugs Comparison - August 2025
7 Best Iridium Spark Plugs In the UK
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
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| 1 Best Choice  9.9Exceptional | 2  9.8Exceptional | 3  9.7Exceptional | 4 Best Value  9.5Excellent | 5  9.4Excellent | 6  9.3Excellent | 7  9.2Excellent |
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ModelDENSO Iridium TT Spark Plug - IK20TT - Twin Tip - The Premium Quality Ultra-Efficient Ignition Replacement - Fits Honda Fiat Ford Mercedes-Benz Mazda Jaguar Alfa Romeo | Model NGK Spark Plug BR9ECMIX Iridium IX 2707 | Model Bosch Double Iridium 0242135812 (N48), Spark Plug Set of 4 - for a Reliable Gasoline Engine Start and Long Service Life - with Robust Design | Model NGK Spark Plug SILZKGR8B8S 94201 Iridium IX | Model Bosch FR6KI332S - Spark Plugs Double Iridium - 1 piece | Model Bosch FR6LI332S - Spark Plugs Double Iridium - 1 piece | Model Bosch HR7NII332W - Spark Plugs Double Iridium - 1 piece |
BrandDENSO | Brand NGK | Brand Bosch Automotive | Brand NGK | Brand Bosch Automotive | Brand Bosch Automotive | Brand Bosch Automotive |
Reviews | Reviews | Reviews | Reviews  | Reviews | Reviews | Reviews |
Tech Specs | ||||||
item weight 50 g | item weight 50 g | item weight 184 g | item weight 40 g | item weight 0.05 g | item weight 40 g | item weight 50 g |
oem part number 0031598003, 03C905601A, 0948200548, 1214026, 12787099 | oem part number Kawasaki 92070-0016 | oem part number 12120034098, 12120035531, 5960E2, 5960G4, 5960L5 | oem part number BMW 12 12 0 040 551 / 12 12 0 041 666 | oem part number MN163236, 1822A002, 32017042, 32017044, 0 242 240 635, 0 242 240 653, CCH9802, IK20TT, SK20PR-A8, VK20Y, 43031z, | oem part number OPEL:32017050 | oem part number FORD 1686133, FORD AG9G12405BC, GMC 12622561, OPEL 32017034, OPEL 32017040 |
manufacturer part number IK20TT | manufacturer part number BR9ECMIX | manufacturer part number 0242135812 | manufacturer part number SILZKGR8B8S | manufacturer part number 0242240653 | manufacturer part number 0242240654 | manufacturer part number 0242236663 |
customer reviews4.5 4.5 out of 5 stars 670 ratings 4.5 out of 5 stars | customer reviews 4.8 4.8 out of 5 stars 213 ratings 4.8 out of 5 stars | customer reviews 4.3 4.3 out of 5 stars 97 ratings 4.3 out of 5 stars | customer reviews 4.7 4.7 out of 5 stars 93 ratings 4.7 out of 5 stars | customer reviews 4.4 4.4 out of 5 stars 415 ratings 4.4 out of 5 stars | customer reviews 4.5 4.5 out of 5 stars 92 ratings 4.5 out of 5 stars | customer reviews 4.3 4.3 out of 5 stars 50 ratings 4.3 out of 5 stars |
product dimensions 8.5 x 2.5 x 2.5 cm 50 g | product dimensions 12.7 x 12.7 x 3.3 cm 50 g | product dimensions - | product dimensions 9.4 x 2.4 x 2.1 cm 40 g | product dimensions 0.87 x 1.02 x 3.23 cm 0.05 g | product dimensions 2 x 3 x 9 cm 40 g | product dimensions 2 x 3 x 10 cm 50 g |
model IK20TT | model BR9ECMIX | model - | model SILZKGR8B8S | model FR6KI332S | model - | model BOSCH 0 242 236 663 Spark Plugs |
Available On | Available On | Available On | Available On | Available On | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.9
1DENSODENSO Iridium TT Spark Plug - IK20TT - Twin Tip - The Premium Quality Ultra-Efficient Ignition Replacement - Fits Honda Fiat Ford Mercedes-Benz Mazda Jaguar Alfa Romeo
Main highlights- Using DENSO’s exclusive iridium alloy having a very high melting point, the tip of the center electrode can be shaped very thin and fine, reducing spark voltage requirements and greatly improving ignitability.
- The iridium tip is mounted with an “All-around Laser Welding” method that insures high reliability even under the most severe driving conditions.
- The Finest Twin Tip plug with improved acceletation, fuel economy and longevity compared to single tip plugs. The quenching effect has been decreased by forming the electrode into a double needle shape. As a result, the flame kernel rapidly develops and the engine’s power is drawn out to its maximum potential. DENSO IRIDIUM TT spark plugs have a φ0.4 mm iridium alloy center electrode and a 0.7 mm needle-type platinum alloy ground electrode.
- IK20TT | Twin Tip Plug | Tightneing Torque (Nm): 22 | 1 - Earthed Electrode | Diameter (mm): 14 | Thread Length (mm): 19
- All specification types include an embedded, highly reliable, monolithic resistor to eliminate electoromagnetic noise interference from all kinds of electronic devices.
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9.8
2NGK
NGK Spark Plug BR9ECMIX Iridium IX 2707
Main highlights- The 0.6mm laser welded fine Iridium tip ensures high durability and a consistently stable spark and the tapered ground electrode minimizes electrical quenching effect
- Longer insulator nose prevents fouling, the corrugated ribs on insulator prevents flashover, and a triple gasket seal eliminates combustion gas leakage
- Designed specifically for the performance enthusiast, Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling
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9.7
3Bosch Automotive
Bosch Double Iridium 0242135812 (N48), Spark Plug Set of 4 - for a Reliable Gasoline Engine Start and Long Service Life - with Robust Design
Main highlights- We are here to help: In case further information about this product is needed, please reach out via the Amazon Customer Questions and Answers section, and our dedicated team will assist you
- Tech specs: 4 iridium spark plugs - Electrode gap: 0.7 mm - Thread length and size: 26.5 mm, 12 mm - Spark position: 5 mm - Prescribed tightening torque: 28 Nm
- High performance: Designed with iridium at the center and ground electrodes for a smoother ride and a higher wear resistance
- Heroes under the hood: With more then 120 years of ignition expertise, Bosch spark plugs have original equipment quality and are trusted by many well-known manufacturers worldwide
- Easy to replace: No adjustment necessary as the electrode gap is pre-set - It's advised not to lubricate the thread and to use a torque wrench - Refer to the instruction manual for guidance
- Compatibility matters: Use the parts' search function at the top of this page to find the correct spark plug for your vehicle, the engine requirements define the spark plug design needed for each car
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Value for money
TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
