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Prices may varyThis product ranks #10 of 31 in Spark Plug.Three above it ↓
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.
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; community reports of replacement at 100,000 km on the Mazda MX-5 NC confirm it reaches the rated interval. Center electrode tip diameter is not disclosed. Plugs arrive pre-gapped per multiple reports.
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.
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.
The Amazon listing for NGK Laser Iridium ITR6F13 Spark Plug carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including rubber, vinyl, plastic, and metal automotive parts — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive accessory, NGK Laser Iridium ITR6F13 Spark Plug has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from NGK, via Amazon. Not editorial.
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