BOSCH
More Information for BOSCH 7421
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BOSCH 7421  
$3.91
Price
 $0.00
Core
 + Sold in packs of 1x1
Pack
 $3.91
Total
Add to Cart
[Wholesaler Closeout -- 30 Day Warranty] (Only 3 Remaining)
BOSCH 7421close
Part image
OE/Specialty
Which BOSCH Spark Plug Is Right For You?

Material / Series Lifespan / Durability Performance / Ignitability Efficiency / Fuel Economy
Copper / Nickel
Copper		 ★★ ★
Platinum
Platinum		 ★★★★ ★★★★ ★★
Double Platinum
Double Platinum		 ★★★★★ ★★★ ★★
Iridium
Iridium		 ★★★★★★ ★★★★★ ★★★
Double Iridium
Double Iridium		 ★★★★★★★ ★★★★★ ★★★
Double Iridium Pin-to-Pin
Double Iridium Pin-To-Pin		 ★★★★★★★ ★★★★ ★★★
Additional Resources

Diagram of Proper Torquing
Spark Plug Condition Identification
Spark Plug Gap Illustrations
Spark Plug Temperature Curves-Heat Range
OEM / Interchange Numbers: AI3923, XP3923

Closeout Inventory Warranty Information:
Wholesaler Closeout items have a 30 day warranty (but still are covered by our Return Policy).

Regular Inventory Warranty Information:
12 Months Satisfaction Guarantee for Double Iridium, Double Platinum, and Platinum Spark Plugs Only
Warranty Details