DENSO 3485 Iridium Long Life Spark Plug

The DENSO 3485 Iridium Long Life spark plug features a 0.7mm iridium-tipped laser-welded fine wire center electrode and platinum-tipped ground electrode, offering the same premium quality found in factory-installed plugs on luxury vehicles from GM, Toyota, Honda, and Mitsubishi. This OE-style iridium plug utilizes an iridium alloy center electrode with 90% iridium concentration and platinum ground strap, secured by DENSO's patented 360-degree laser welding process for exceptional bonding strength.

Key Features:

• Iridium alloy is six times harder and eight times stronger than conventional platinum, capable of handling temperatures over 4,000°F associated with high-performance ignition and special fuel systems including turbo, supercharger, and nitrous applications
• Service life of over 100,000 miles—up to three times longer than conventional spark plugs
• Machine-rolled threads prevent seizing or cross-threading during installation and removal
• 100% pre-fired for quality assurance, with purified alumina powder insulator for exceptional strength and thermal conductivity
• Five-rib insulator design prevents flashover, with copper-glass seal bonding center electrode and insulator for gas-tight seal
• Enables complete fuel ignition in the combustion chamber, virtually eliminating erratic starts caused by poor fuel mixtures and excessive soot buildup

Manufactured to the strictest OE performance, durability, and emissions standards. Also known as FK16R-A8, this plug replaces Toyota OEM part number 90919-01265. Installation torque specifications: 26-30 lb-ft for cast iron heads, 15-22 lb-ft for aluminum heads.