The Best Spark Plugs 2025

1. Lisle 20200 - Spark Plug Hole Thread Chaser

Lisle 20200 - Spark Plug Hole Thread Chaser

Key Features: Double-Ended For Both 14MM & 18MM Threads.Cleans Threads In Spark Plug Hole Use With 13/16" Spark Plug Socket.

2. E3 Spark Plugs E3.12 Premium Lawn and Garden Spark Plug with DiamondFIRE Technology

The E3.12 lawn and garden spark plug is designed to optimize performance for 4-cycle, overhead valve small engines, making it the ideal choice for a wide variety of lawn and garden applications. It features a 14 mm. thread diameter and 0.375" reach with a gasket seat. The patented DiamondFIRE ground electrode delivers enhanced power, improved fuel efficiency, and a significant reduction in hydrocarbon emissions. Its innovative design helps to create an edge-to-edge spark path, promoting more complete combustion and better overall engine performance. Its proven ability to increase power by 6% to 12% (depending on engine class), improve fuel efficiency by 4% to 13%, and reduce CO and hydrocarbon emissions makes the E3.12 an eco-friendly option.

Designed to optimize performance for 4-cycle, overhead valve small engines Ideal choice for a wide variety of lawn and garden applications DiamondFire technology enhances combustion efficiency and engine performance Features a 14 mm. thread diameter and 0.375" reach with a gasket seat Increases power by up to 4%-12% and improves fuel economy by up to 3%-13% Innovative design helps to create an edge-to-edge spark path This product is backed by a limited lifetime warranty

3. Fram Autolite Plat Ap646

Pt SparkPlug

Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, Autolite Platinum spark plugs provide a center wire platinum firing tip which provides reduced gap erosion, fewer misfires, better performance and increased durability. Warrantied for 4 years. Consider upgrading to Autolite Double Platinum or Iridium XP spark plugs for increased performance. Autolite AP646 Platinum Spark Plug

4. Fram Autolite Platinum Sparkplug 20065

Pt SparkPlug 2p

Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, Autolite Platinum spark plugs provide a center wire platinum firing tip which provides reduced gap erosion, fewer misfires, better performance and increased durability. Warrantied for 4 years. Consider upgrading to Autolite Double Platinum or Iridium XP spark plugs for increased performance. Autolite AP65DP2 Platinum Spark Plug - Display Pack - 2pk

5. Autolite Platinum Plug, AP105, 2 Count

Autolite Platinum Plug, AP105, 2 Count

Autolite Platinum Plug, AP105, 2 Count

6. HUSQVARNA SPARK PLUG RCJ6Y 952030249

Weed Eater 952030249 Sparkplug For All Poulan Gas Powered String Trimmers Blowers

952030249, Husqvarna, Weed Eater 952030249 Sparkplug For All Poulan Gas Powered String Trimmers & Blowers, Spark Plugs

7. HeliCoil Spark Plug Thread Insert

HeliCoil Spark Plug Thread Insert

HeliCoil Spark Plug Thread Insert

8. Robert Bosch 14 mm-1.25 High-Carbon Steel Metric Spark Plug Tap

High-Carbon Steel Metric Spark Plug Tap Ideal for cutting right-hand internal metric threads, Bosch metric plug taps are ideal for cutting internal threads in import cars, motorcycles and machinery. They provide three to five threads chamfered for general-purpose applications. They are recommended when there is sufficient room on a blind hole and tapping to the bottom of a hole is not critical. Made from heat-treated carbon steel, they are rust- and tarnish-resistant tools that work equally well in plastic drilling applications. The rolled threads are more accurate and cleaner than machined threads. They are tooled to the most exacting specifications to ensure that bolts anchor securely. Laser-etched marking ensures size identification and won't wear off. They feature a precise flute design to ensure fast and easy chip clearance. Specifications Size: 14 mm-1.25 Country of Origin: US Weight: 0.06 lbs - SKU: BSTWC7590

High Carbon Steel Metric Taps Are Ideal For Cutting Internal Threads In Import Cars, Motorcycles And Machinery. Four-Flute Design On Most Taps Ensures Fast And Easy Chip Clearance

9. Lisle 20000 M12-1.25 Spark Plug Chaser

The Narrow Profile Allows Access to Spark Plug Holes in Confined Spaces.

Use with a 3/8'' ratchet and locking extension Also for use on Mercedes Benz most V6 and some V8 models newer than 2006, Nissan 2.0L 2007 and newer, Toyota Scion 1.8L 2008 and newer Size M12 x 1.25 Can also be used on some motorcycles, lawn mowers, snowmobiles and other small engine applications For use on 2nd Generation Ford Triton Engines 2008 and newer

10. K Tool International 5/8 " X 3/8 " DR 6-PT FLEX SPARK PLUG SO

5/8 IN. X 3/8 I

Features protective rubber insert Manufactured from chrome vanadium steel Heat treated for additional strength and durability Flex joint enables tool to reach tight and confined areas Lifetime Guarantee