DENSO
More Information for DENSO 5378
{Alternate Inventory Numbers: IWF20}
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DENSO 5378  
$5.70
Price
$0.00
Core
+ Sold in packs of 1x1
Pack
$5.70
Total
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DENSO 5378 Specifications
Center Electrode Core MaterialCopper
Center Electrode Tip MaterialIridium
Ground ConfigurationStandard
Ground Electrode Core MaterialNickel
Ground Electrode Quantity1
Ground Electrode Tip DesignTapercut, U-Groove
Hex Size20.6 mm
Manufacturer Heat Range20
Pre-Gap Size0.8 mm
Reach12.7 mm
Resistance5000.0 oh
Seat TypeFlat
Thread Diameter14.0 mm
Iridium Power; Pre-Set Gap: 0.032"
Features & Benefits:
  • LIFESPAN / DURABILITY | Iridium alloy is 6X harder and 8X stronger than Platinum
    • Iridium with Rhodium Center Electrode -- has the highest concentration of Iridium of any spark plug and outperforms in the most severe engine temperatures, resisting oxidation and voltage wear for over 100,000 miles.
    • Patented 360-Degree Laser Welding -- creates the highest quality bond for structural support of the center electrode.
  • PERFORMANCE / IGNITABILITY
    • 0.4 mm Fine Wire Iridium Center Electrode -- achieves higher ignitability and requires lower spark voltage to enable high-response driving with fewer misfires. As a result, acceleration improves in comparison with normal plugs.
    • Tapered Cut Ground Electrode -- improves firing performance by reducing quenching.
  • EFFICIENCY / FUEL ECONOMY
    • Patented U-Groove Ground Electrode -- enables complete combustion by allowing the spark to fill the gap created by the U shape. The ball of fire created in the U-Groove develops a larger and hotter flash front that virtually eliminates excessive fouling and erratic starts caused by poor fuel mixtures.
Performance
Fuel Mileage
Which DENSO Spark Plug Is Right For You?

Material / Series Lifespan / Durability Performance / Ignitability Efficiency / Fuel Economy
Copper / Nickel U-Groove
U-Groove
Platinum Twin Tip
Platinum Twin-Tip
★★★★ ★★ ★★
Double Platinum
Double Platinum
★★★★★ ★★ ★★
Iridium Twin Tip
Iridium Twin Tip
★★★★★★ ★★★★ ★★★
Iridium Power
Iridium Power
★★★★ ★★★★★ ★★★
Iridium Long Life
Iridium Long Life
★★★★★★ ★★★★ ★★
Videos

How To Replace DENSO Spark Plugs

Additional Resources

More Information about Iridium Power Features and Structure

Warranty Information:
No Warranty