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Advance Auto Parts Logo
1205 E Main St
Columbus, OH 43205
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Product Information

Product Details
Part No. 4085
Warranty Details (60 DAY REPLACEMENT IF DEFECTIVE)
NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

Product Features:
  • SINGLE IRIDIUM TIP: Fine wire 0.6 millimeter iridium tip center electrode ensures high durability and a consistently stable spark
  • IRIDIUM ALLOY CENTER ELECTRODE: Iridium's density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
  • TAPERED CUT GROUND ELECTRODE: Reduced quenching design produces outstanding ignitability, improved acceleration, fuel efficiency and durability
  • SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
  • TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
  • RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
Specifications
Center Electrode Core Material:
Copper Core

Center Electrode Tip Material:
Iridium

Electrode Core Material:
Iridium

Electrode Tip Material:
Iridium

Gap Size:
0.032 in

Ground Configuration:
Standard

Ground Electrode Core Material:
Nickel Core

Ground Electrode Quantity:
1

Ground Electrode Tip Design:
Taper Cut

Ground Strap Quantity:
1

Hex Size:
13/16 in

Manufacturer Heat Range:
6

Reach:
12.7 mm

Resistor:
Yes

Seat Type:
Gasket

Shorty Spark Plug:
No

Spark Plug Approximate Resistor Value:
5K Ohm

Thread Diameter:
14 mm

Tip Configuration:
Loose

Type:
Iridium IX

Wrench Diameter:
13/16 in

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