AUTOLITE
More Information for AUTOLITE AP5503
{Alternate Inventory Numbers: AP5503:8, AP5503DP2}
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AUTOLITE AP5503  
($1.31/Each)
Price
 $0.00
Core
 + Sold in packs of 1x1
Pack
 $1.31
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AUTOLITE AP5503 Specifications
Center Electrode Core MaterialCopper
Center Electrode DesignStandard
Center Electrode Tip MaterialPlatinum
Electrical Terminal TypeStud
Gap Size0.044"
Gap Size1.1mm
Ground Electrode Core MaterialNickel
Ground Electrode Quantity1
Ground Electrode Tip DesignTapered
Ground Electrode Tip MaterialNickel
Hex Size16mm
Hex Size5/8"
Insulator MaterialCeramic
Reach19.5mm
Reach0.75"
Resistance4000 82
Resistor TypeYes
Seat TypeFlat
Thread Diameter14mm
Tip ConfigurationMid Projection
Platinum; 5/8" Hex Size
Step up to platinum. A center wire platinum firing tip provides improved performance and durability*. They fire quicker and cleaner with less voltage for easier starts, quicker acceleration and improved fuel economy versus standard plugs.

Features & Benefits:
  • Platinum center wire firing tip for improved performance.
  • Super conductive Yttrium enhanced ground electrode provides superior heat transfer
  • Full platinum tip assures virtually no gap erosion for longer plug life
  • Leak proof, heat fused resistor for durability
*Compared to standard copper plugs

This spark plug is pre-gapped, but may require minor adjustments with a Spark Plug Gap Tool / Feeler Gauge to match your engine's specifications. For proper engine performance, gaps should be within ±0.004" of OE-Recommended value.
Which AUTOLITE 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 XP
Iridium XP		 ★★★★★ ★★★★★ ★★
Iridium Ultra
Iridium Ultra		 ★★★★★★ ★★★★★ ★★

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

Regular Inventory Warranty Information:
48 Months
Warranty Details