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Prices may varyThis product ranks #1 of 31 in Spark Plug.
Last reviewed May 29, 2026
TL;DR Denso is Toyota's OE plug supplier; this part (Toyota 90919-01191) uses a 0.7mm iridium center electrode with platinum ground, rated 100,000 miles, with community-confirmed gap integrity at that interval.
The SK20HR11 uses a 0.7mm iridium center electrode (360° laser-welded) and a platinum-tipped ground. Denso supplies this plug to Toyota as OEM part 90919-01191. Rated 100,000 miles; owners report gap maintained at that interval, with a third change at 300,000 miles on a Toyota V6. Factory gap 1.1mm (0.043"), pre-set confirmed by Tacoma owners. Fitment covers Toyota (Tacoma 2005·2015, Tundra, 4Runner, Sequoia), Lexus, BMW, Honda, Porsche, and Volvo across 65+ application lines. Owners dispute 2006 Volvo S60 fitment; verify before ordering.
Right pick for 2005·2015 Tacoma and Toyota/Lexus applications OEM-specified for this plug. OE-confirmed cross-reference, gap ships pre-set. Skip for 2006 Volvo S60; one community report disputes fitment for that engine, warranting a check against the Volvo-specific part number.
No chemical exposure: passive ceramic-and-steel part, no SDS. Iridium and platinum tips carry trace PGM content, offset by the 100,000-mile interval. Steel shell is recyclable as ferrous scrap; alumina-ceramic insulator goes to landfill.
Yes. Denso is Toyota's OEM spark plug supplier, and Denso part 3421 (SK20HR11) is the same plug Toyota sells through its dealer parts channel as part number 90919-01191. The Rainforest API product data for this ASIN explicitly lists Toyota 90919-01191 and Toyota 90048-51185 in the OEM Equivalent Part Number field.
Yes. The factory gap is 1.1mm (0.043 inches), and owners confirm the plugs arrive pre-gapped to spec for Toyota Tacoma applications · no adjustment required for the standard Toyota NA application.
Denso rates the SK20HR11 for 100,000 miles. Owners report the plugs maintaining their original gap through 100,000 miles on Toyota engines, with some describing a third plug change at 300,000 total miles, consistent with the manufacturer's rated interval.
The Amazon fitment listing explicitly includes 2005·2015 Toyota Tacoma. The 4-cylinder 2TR-FE and V6 1GR-FE engine families used in 2nd-gen Tacomas are both listed. Multiple Tacoma-specific owner reviews confirm correct fit and running-condition improvement. This plug is the OEM specification for this application.
The Amazon listing for Denso SK20HR11 Iridium Long Life 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, Denso SK20HR11 Iridium Long Life Spark Plug has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from Denso, via Amazon. Not editorial.
Per manufacturer cross-reference. Verify on Amazon before purchase.
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