Double Iridium Spark Plugs
WOWLTZ's Service Purpose
- Provide free samples to test
- Support OEM & ODM services
- Ensure Quick Delivery
- Provide Technical Support
- Strong Warranty and After-Sales Service
WOWLTZ Double Iridium spark plugs are equipped with a laser-welded iridium-enhanced center electrode and a double iridium design that ensures superior engine performance and longevity. With a focus on durability and optimal ignition, these plugs provide enhanced ignitability, smooth acceleration, and maximum fuel efficiency. The double iridium construction significantly reduces electrode wear, allowing your engine to maintain high performance for longer periods. As an ideal OE replacement plug for modern engines, WOWLTZ Double Iridium spark plugs deliver consistent power, improved throttle response, and reliable starts, making them the perfect choice for drivers seeking advanced ignition technology.
Iridium-Enhanced Laser-Welded Finewire Center Electrode
The iridium-enhanced laser-welded finewire center electrode provides focused ignition, optimal ignitability, and maximum performance.
Proprietary Platinum Ground Electrode
Its proprietary platinum ground electrode provides increased durability and resistance to wear, extending the life of the plug.
Tapered Ground Wire
Its tapered ground wire enhances ignitability for improved combustion & performance.
High Alumina Ceramic Insulator
Its high alumina ceramic insulator provides thermal conductivity and superior insulation for increased strength.
Multi-Rib Insulator Design
Multi-rib insulator prevents flash-over.
Copper Core
The copper core within the plug provides reliable performance with higher thermal conductivity.
Corrosion-Resistant Nickel-Plated Shell
Nickel-plated shell is corrosion resistant to provide increased durability for extended life.
Spark Plug Installation and Service Suggestion
Replacing spark plugs can be a simple job, if you take things one step at a time. Here’s a general guide to the proper procedures.
Gather needed tools and parts
A set of Autolite spark plugs, a ratchet, a spark plug socket (make sure you have the right size), extensions, a gapping tool, and dielectric grease. Other hand tools may be needed on some vehicles.
Remove spark plug wires or coils
Grasp the plug wire boot and twist it about one-quarter turn to loosen the seal, and then pull straight off. Stubborn boots may require using plug wire boot pliers. Number plug wires with tape as you remove them to avoid crossing them, or only disconnect one at a time. If your vehicle is coil-on-plug, disconnect the coil connectors, remove the hold-down bolts, and remove the coils.
Clean the contaminants around the spark plug
Before loosening each spark plug, clean dirt or fluids out of the plug seat area with a blast of compressed air, a shop vacuum, or by blowing around the spark plug through a soda straw. This prevents contaminants from falling into combustion chamber when the old plugs are removed.
Remove plugs and line them up in cylinder order
A thorough visual inspection of the plugs can identify problems that may need correction or show you they are all good. Autolite publishes a plug tip inspection guide with more information.
Adjust the gap of the new spark plug
Gap new plugs as recommended in owner’s manual or Autolite Spark Plug Catalog. Use a gapping tool gauge to measure the gap between the center and ground electrode. The gauge should pass through snugly but easily. If too loose or tight, use the gapping tool to correct the gap.
Tighten the spark plug
Screw new plugs in by hand until tight. If a plug tightens up too soon while turning them in by hand, use a thread chaser to clean the threads. Use a torque wrench to tighten spark plugs following manufacturer’s recommendations, or refer to the torque chart in the Autolite Spark Plug Catalog if you don’t have a torque wrench.
Inspect the plug wires and boots
Inspect the plug wires and boots (or the coils and boots on coil-on-plug systems) for brittleness or cracking, and check for corrosion onthe plug terminals inside each boot. Replace suspect coils, boots and or wires as needed. Lubricate the plug contact area inside each boot with Dielectric Grease and then reinstall the plug wires (or coils and boots) making sure they are installed in the correct order and fastened securely.
Verify your repair by starting the engine
Misfires or a rough idle can mean the wires are in the wrong order or loose. Recheck firing order and coil connections closely if the engine still isn’t running right.
Torque Specifications
| Plug Thread & Seat | Cast Iron Heads | Aluminum Heads | ||
| SAE | Metric | SAE | Metric | |
| 10mm Gasket | 7-11 ft lb | 10-15 nm | 7-11 ft lb | 10-15 nm |
| 12mm Gasket | 11-19 ft lb | 15-25 nm | 11-19 ft lb | 15-25 nm |
| 14mm Gasket | 16-29 ft lb | 35-40 nm | 15-22 ft lb | 20-30 nm |
| 18mm Gasket | 32-38 ft lb | 43-52 nm | 28-34 ft lb | 38-46 nm |
| 14mm Tapered | 7-15 ft lb | 9-20 nm | 7-15 ft lb | 9-20 nm |
| 18mm Tapered | 15-20 ft lb | 20-27 nm | 15-20 ft lb | 20-27 nm |
NOTE: Spark plugs should be installed with clean and dry threads to avoid over-torqueing.This can distort the metal plug shell, which often results in engine damage.
Gasket Seat -
Finger Tight Plug -
10mm Gasket Seat 1/4 Turn -
12mm Gasket Seat 3/8 Turn -
Tapered Seat -
Tight to: -
14 & 18mm Gasket Seat 1/2 Turn -
14 & 18mm Tapered Seat 1/16 Turn
Metallurgy Comparison Chart
| Less Mileage | Mileage / Service life | More Mileage |
| Less | Full Efficiency | More |
| Less | Fouling Resistance | More |
