DENSO 5071 Double Platinum Spark Plug - TJ14R-P15

The DENSO 5071 Double Platinum Spark Plug delivers OE-quality performance and extended service life for superior ignition reliability. Featuring platinum on both the center and ground electrodes, this spark plug is engineered to provide sustained spark performance for over 60,000 miles with exceptional resistance to erosion and corrosion.

Key Features:

• Double platinum design with 0.059" (1.5mm) pre-gap for long-lasting performance
• 14mm thread diameter with 1.25mm pitch and 18mm reach for precise fitment
• Fine wire platinum center electrode paired with platinum-tipped ground electrode
• Purified alumina powder insulator provides exceptional strength and thermal conductivity
• Five-rib insulator design prevents flashover for reliable ignition
• Machine-rolled threads prevent seizing or cross-threading during installation
• Copper-glass seal bonds center electrode and insulator for gas-tight seal
• 100% pre-fired to ensure highest quality standards
• 5/8" (16mm) hex size with tapered seat and solid terminal type

Manufactured to the strictest OE performance, durability, and emissions standards, this spark plug improves engine performance, throttle response, and fuel efficiency. The double platinum construction ensures stable combustion during idling and improved cold-starting performance. Cross-references to GM part numbers 19301807, 12578277, and 25161677.