Denso 5319 Spark Plug

Buyer fitment guide only intended as reference. Please use catalogue search by vehicle to ensure proper fitment.

• DENSO Auto Parts IW31
• DENSO Auto Parts IW31#4
• NAPA Mileage Plus 5319

• 0.4mm iridium Tip
• Available for many performance and power sports applications, including Corvette, Viper, and Harley-Davidson
• Improved spark ignition for maximum combustion, even with lean air-fuel mixtures
• Patented 360-degree laser welding assembly process
• Tapered cut, U-Groove ground electrode
• Unsurpassed center electrode durability
• Iridium Power© best demonstrates its performance improvement during acceleration. The world€™s smallest center electrode and specially shaped ground electrode deliver maximum spark energy while withstanding temperatures greater than 4000º F. These features combine to achieve higher ignitability and require lower spark voltage than ever before. As a result, acceleration improves in comparison with normal plugs. To increase ignitability, the important point is to let the flame kernel produced by the spark to grow unobstructed. Normally, this can be accomplished by widening the spark gap. However, this causes spark voltage to increase, which has the opposite effect. Iridium Power uses DENSO€™s patented U-Groove ground electrode to achieve maximum ignitab