NGK Laser Iridium Premium Spark Plug Set (x4) – ILTR6A-13G
Complete NGK Laser Iridium spark plug service set for Mazda MX-5 MK3 / NC, MK3.5 / NC2 and MK3.75 / NC3 2.0L MZR petrol engines (2005–2015). Supplied by MazSpec as a set of four NGK ILTR6A-13G spark plugs, providing the quantity required for all four cylinders.
NGK Laser Iridium spark plugs are engineered for consistent ignition performance, dependable engine operation and extended service life. They combine a durable iridium centre electrode with a platinum-tipped ground electrode, making them an excellent replacement choice for engines requiring this original-equipment-style spark plug specification.
Spark plugs ignite the compressed air and fuel mixture inside each cylinder. Over time, electrode wear, deposits and general deterioration can affect ignition performance, potentially causing difficult starting, intermittent misfires, rough idle or reduced engine response.
The ILTR6A-13G uses an iridium centre electrode that resists wear and promotes dependable spark formation. Its platinum-tipped ground electrode provides additional durability, helping maintain consistent ignition characteristics over the intended service life.
Manufactured to suit the corresponding engine application, these spark plugs feature NGK heat range 6, a tapered seat, M14 × 1.25 thread and a factory-set 1.3mm electrode gap.
MazSpec supplies this product as a complete four-plug service set, providing a convenient solution for routine servicing and full ignition maintenance on the Mazda MX-5 NC 2.0L engine.
Product features and specifications:
- Product type: Laser Iridium ignition spark plug set
- Brand: NGK
- Manufacturer's part number: ILTR6A-13G
- NGK stock number: 3789
- Spark plug technology: Laser Iridium
- Centre electrode: Iridium
- Ground electrode: Platinum-tipped
- NGK heat range: 6
- Thread diameter: M14
- Thread pitch: 1.25mm
- Thread reach: 25mm
- Hex / socket size: 16mm
- Electrode gap: 1.3mm, factory set
- Seat design: Tapered
- Terminal: Fixed SAE connector
- Resistor: 5 kOhm
- Engine application: Mazda MZR LF 2.0L petrol
- Vehicle application: Mazda MX-5 MK3 / NC, NC2 and NC3
- Quantity supplied: 4 spark plugs
- Quantity required per engine: 4 spark plugs
Benefits of NGK Laser Iridium Technology:
- Iridium centre electrode: Offers excellent resistance to electrode wear and supports dependable spark generation.
- Platinum-tipped ground electrode: Helps maintain consistent ignition characteristics over the service interval.
- Factory-set electrode gap: Supplied with the specified 1.3mm gap.
- Vehicle-specific heat range: NGK heat range 6 for the compatible Mazda MZR 2.0L engine application.
- Complete service set: Four matching spark plugs for all four cylinders.
Common replacement reasons: Spark plugs may require renewal during routine servicing or following electrode wear, carbon deposits, ignition misfires, hard starting or uneven engine operation. Installing four matching plugs helps maintain consistent ignition performance across the engine.
Fitment advice: Designed for Mazda MX-5 NC 2.0L MZR petrol engines using the NGK ILTR6A-13G specification. Not suitable for the MX-5 NC 1.8L engine, which uses NGK TR5AI-13, or the MX-5 MK4 / ND 2.0L SKYACTIV-G engine, which uses a different spark plug specification.
Other items to consider: When carrying out a routine engine service, consider replacing the engine oil, oil filter and engine air filter. Ignition coils may also require inspection if the vehicle has an existing misfire or ignition-related fault.
Useful tools / consumables: 16mm spark plug socket, suitable extension bar, calibrated torque wrench and clean workshop cloths or appropriate equipment for clearing debris from the spark plug wells.
Difficulty guide: DIY Difficulty: Easy to Moderate. Spark plug replacement is a routine service task, but care is needed when removing ignition coils and installing the new spark plugs into the aluminium cylinder head.
Why NGK? NGK is a leading specialist in automotive ignition technology, supplying spark plugs for original-equipment and aftermarket applications. Its Laser Iridium range combines precision engineering, durable electrode materials and application-specific specifications to deliver dependable ignition performance.
What's in the box: 4 × NGK ILTR6A-13G Laser Iridium Spark Plugs (NGK stock number 3789), supplied as one complete four-cylinder engine service set.
Installation / service notes: Allow the engine to cool before removing the original spark plugs. Disconnect the ignition coils and clean around the spark plug wells before removal to prevent contamination entering the combustion chambers. Inspect each new spark plug for damage and start threading it by hand to prevent cross-threading. The electrode gap is factory set and should not normally be adjusted. Tighten the plugs to the applicable NGK or Mazda tapered-seat specification using a calibrated torque wrench. Refit the ignition coils and connectors securely, then confirm smooth engine operation following installation.
| Make | Model | Sub Variant | Chassis / Code | Years | Power (PS) | Engine Codes | Fuel | Transmission | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Mazda | MX-5 MK3 / NC | NC1 2.0L | NCEC | 2005–2008 | 160 | LF / LF-VE | Petrol | 5-speed / 6-speed manual; automatic where fitted | NGK ILTR6A-13G, stock 3789; 4 plugs per engine |
| Mazda | MX-5 MK3.5 / NC | NC2 2.0L | NCEC | 2009–2012 | 160 | LF / LF-VE | Petrol | 5-speed / 6-speed manual; automatic where fitted | NGK ILTR6A-13G, stock 3789; 4 plugs per engine |
| Mazda | MX-5 MK3.75 / NC | NC3 2.0L | NCEC | 2013–2015 | 160 | LF / LF-VE | Petrol | 5-speed / 6-speed manual; automatic where fitted | NGK ILTR6A-13G, stock 3789; 4 plugs per engine |
| Vehicle Manufacturer / Reference Type | Reference Number |
|---|---|
| NGK Manufacturer's Part Number | ILTR6A-13G |
| NGK Stock Number | 3789 |
| Mazda | L3Y1-18-110 |
| Mazda | L3G2-18-110 |
| Mazda | 0000-18-L3Y1 |