ZTJ16R10 Iridium Long Life (Gm) Spark Plug
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Denso ZTJ16R10 Iridium Long Life (Gm) Spark Plug

Part No. 5090 Warranty Details  
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Iridium Long Life - Patented Iridium Alloy Plug (90% Ir) with Platinum Ground Strap

Product Features:
  • Iridium Long Life - Patented Iridium Alloy Plug (90% Ir) with Platinum Ground Strap
  • 100% pre-fired to assure high quality
  • Copper-glass seal bonds the center electrode and insulator together for a gas-tight seal; maintains proper heat and excludes hot combustion gases
  • Purified alumina powder insulator provides exceptional dielectric strength and thermal conductivity, allowing the material to stand up to extreme stress
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Electrode Core Material:Copper
Electrode Tip Material:0.5mm Iridium
Ground Strap Quantity:1
Insulator Type:Purified Alumina
Manufacturer Heat Range:16
Material:0.5mm Iridium
Reach:.708 in
Seat Type:Tapered
Thread Diameter:14 mm
Tip Configuration:0.5mm Iridium
Type:Iridium Long Life
Wrench Diameter:5/8 in

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2 Questions | 2 Answers
Displaying questions 1-2
  • Q:

    Do these plug need to be gapped and what is the gap for my 1999 Camaro SS 5.7
    Asked on 3/23/2016 by Jose from West Palm FL

    1 answer



      Hi Jose, I'm glad to assist you! This Denso ZTJ16R10 Iridium Long Life (Gm) Spark Plug - Part No. 5090 is pre-gapped at 0.039 inch from the factory. However, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings.

      Answered on 3/24/2016 by Solomon from AAP
  • Q:

    Are you able to/ do you have to gap these plugs?
    Asked on 9/12/2014 by J from United States

    1 answer



      Hi J, happy to assist you! This Denso spark plug traditionally leaves the factory pre-gapped for their most popular application. However, a plug may fit hundreds of engines, from cars to golf carts. Gapping the plugs to your engine’s specifications is important to prevent pre-ignition, detonation, fouling and poor fuel economy. Even if the preset gap matches that required by your engine, it is always good practice to physically check the Gap as it may have shifted during transportation.

      Answered on 9/15/2014 by Solomon
Displaying questions 1-2

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