NGK Laser Iridium ITR6F13 Spark Plug
Priced as of May 28, 2026
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CarCareTruth's Analysis
Last reviewed May 28, 2026
TL;DR NGK is the OE supplier for Mazda L-series engines; this iridium plug is rated 100,000 miles, community-confirmed on Mazda applications, and arrives pre-gapped. Does not fit Coyote V8 engines.
What it is and how it performs
The ITR6F13 uses a laser-welded iridium center electrode and platinum-tipped ground electrode, with trivalent metal plating on threads for corrosion resistance. NGK is the OE supplier for the Mazda L-series family (OEM cross-refs L341-18-110, L3Y4-18-110, L813-18-110 confirmed). Heat range 6 is confirmed via NGK part-number convention (R6 in ITR6F13). Rated 100,000 miles; a verified-purchase reviewer replaced at 100,000 km on a Mazda MX-5 NC without issues. Center electrode tip diameter is not disclosed. Plugs arrive pre-gapped per multiple verified-purchase reports.
Who should buy this — and who should skip it
Right pick for Mazda L-series 2.0/2.3L engines (Mazda 3, 5, 6, MPV), Ford Focus/C-Max 1.8/2.0L, or Volvo S40/V50 where the workshop manual specifies this plug. Skip for any Coyote V8; thread reach and heat range do not match.
Safety and environmental impact
No chemical exposure pathway from the plug itself. Steel shell is recyclable as ferrous scrap; ceramic insulator goes to landfill. No take-back program exists as of 2026.
From the manufacturer
Marketing copy from NGK, via Amazon. Not editorial.
- •Laser welded iridium center electrode tip ensures high durability and greater spark
- •Platinum disc welded to backside of ground electrode provides long life
- •Longer insulator nose prevents fouling, corrugated ribs on insulator prevents flashover, and the triple gasket seal eliminates combustion gas leakage
- •Faster starts and quicker acceleration
- •Better fuel economy and lower emissions, trivalent metal plating for superior anti-corrosion and anti-seizing
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Manufacturer images
Manufacturer specifications
- Brand
- NGK
- Core Material
- Platinum
- Thread Size
- M14x1.25
- Top Material Type
- Metal
- Vehicle Service Type
- Car
- Brand Name
- NGK
- Manufacturer Part Number
- ITR6F13
- Global Trade Identification Number
- 00087295144770
- UPC
- 087295144770
- OEM Equivalent Part Number
- Ford 1315691 / 3SJ4 12405 AB, Volvo 86 947 49
- Model Number
- ITR6F-13
- Unit Count
- 1.0 Count
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Mazda 6, 2.3L, 2004, i - Sedan.
Perfect fit for Mazda 6, 2004, 2.3L Engine, Sedan.ITR6F-13, Lazer Iridium Spark Plugs, Pre-Gaped (no need to touch the gap), Perfect fit and size as the OEM spark plugs.Amazing Quality, Honestly THE BEST SPARK PLUGS YOU CAN FIND FOR YOUR CAR.LAST FOR EVER xDI also Bought NGK Spark Plug Wires Cuz mine was dead.The whole process took me around 15 mins. Very easy to install, Works like charm.