Best spark plugs for a 2003 Subaru Outback
Spark plug listings at Advance Auto Parts
Advance Auto Parts
Autolite
Autolite Copper Resistor Spark Plug: Quick Starts & Reliable Performance, 3923
MPN 3923
$4.49
Advance Auto Parts
Autolite
Autolite Platinum Spark Plug: Enhanced Durability & Improved Performance, AP3923
MPN AP3923
$5.49
Advance Auto Parts
Autolite Iridium
Autolite Iridium Iridium XP Fine wire Spark Plug: Improved Durability, More Focused Ignition, XP3923
MPN XP3923
$11.49
Advance Auto Parts
Champion
Champion Copper Plus Spark Plug RC10YC4 - Dependable Performance & Durability, 346
MPN 346
$5.49
Advance Auto Parts
Champion
Champion Double Platinum Power Spark Plug RC10PYPB4 - Enhanced Durability & Performance, 7546
MPN 7546
$9.99
Advance Auto Parts
Champion
Champion Iridium Spark Plug RC10WYPB4 - Maximum Performance & Longevity, 9001
MPN 9001
$10.99
Advance Auto Parts
Champion
Champion Iridium Spark Plug REC10WYPB4 - Maximum Performance & Longevity, 9006
MPN 9006
$10.49
Advance Auto Parts
Champion
Champion Platinum Power Spark Plug RC10PYC - Powerful Performance & Longevity, 3346
MPN 3346
$5.49
Advance Auto Parts
DENSO
DENSO Double Platinum Spark Plug: OE Performance, lasts 60K+ Miles, PK20PR11, 3168
MPN 3168
$14.49
Advance Auto Parts
DENSO
DENSO Iridium Long-Life Spark Plug: OE Performance, SK20HPR-L11, 3433
MPN 3433
$19.99
Advance Auto Parts
DENSO
DENSO Iridium Long-Life Spark Plug: OE Performance, SK20PR-L11, 3443
MPN 3443
$18.49
Advance Auto Parts
DENSO
DENSO Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, IK20, 5304
MPN 5304
$14.49
Advance Auto Parts
DENSO
DENSO Platinum TT Spark Plug with Twin-Tip Design for Enhanced Ignition, 4506
MPN 4506
$7.69
Advance Auto Parts
NGK
NGK G-Power Platinum Spark Plug (BKR6EGP): Enhanced Durability & Efficiency, 7092
MPN 7092
$8.99
Advance Auto Parts
NGK
NGK G-Power Platinum Spark Plug (LFR6CGP): Enhanced Durability & Efficiency, 1483
MPN 1483
$14.99
Advance Auto Parts
NGK
NGK Iridium IX Spark Plug (BKR6EIX-11): Enhanced Ignitability & Durability, 3764
MPN 3764
$14.99
Advance Auto Parts
NGK
NGK Iridium IX Spark Plug (LFR6AIX-11): Extreme Ignitability & Durability, 6619
MPN 6619
$17.99
Advance Auto Parts
NGK
NGK Laser Iridium Spark Plug (IFR6E11): Fine Wire Tip for Precision, 6741
MPN 6741
$22.99
Advance Auto Parts
NGK
NGK Laser Platinum Spark Plug (PFR6G-11): Superior Ignitability & Longevity, 5555
MPN 5555
$23.99
Advance Auto Parts
NGK
NGK Laser Platinum Spark Plug (PLFR6A-11): Enhanced Ignitability & Longevity, 7654
MPN 7654
$22.99
Advance Auto Parts
NGK
NGK Ruthenium HX Spark Plug (FR6BHX-S): High Ignitability & Durability, 95159
MPN 95159
$19.49
Advance Auto Parts
NGK
NGK Ruthenium HX Spark Plug (LFR6AHX-S): High Ignitability & Durability, 94122
MPN 94122
$15.99
Advance Auto Parts
NGK
NGK Standard Nickel Spark Plug (BKR6ES-11): Reliable OE Performance, 5553
MPN 5553
$6.99
Advance Auto Parts
NGK
NGK V-Power Nickel Spark Plug (BKR6E-11): Reliable Ignitability & Performance, 2756
MPN 2756
$7.49
Advance Auto Parts
NGK
NGK V-Power Nickel Spark Plug (LFR6A-11): Reliable Performance & Ignitability, 3672
MPN 3672
$10.99Spark plug listings on Amazon
Brand and material notes
Copper plugs are often the least expensive. Platinum and iridium listings usually last longer and cost more. Use the merchant page and your owner’s manual — this site does not assign a heat range or claim a performance gain.
Before you buy
- Confirm the engine code on the vehicle or build sticker.
- Match the OE spark-plug number when you have it.
- Check plug gap, torque, and how many plugs the engine uses.
- Treat Advance and Amazon cards as separate offers, not the same SKU.
Other eligible years
This site contains affiliate links. We may earn a commission if you buy through Advance Auto Parts or Amazon. Listings come from merchant catalogs for the selected year, make, and model. They are not OEM confirmation of engine, plug gap, torque, heat range, or quantity.