Best spark plugs for a 1999 Subaru Legacy
Spark plug listings at Advance Auto Parts
Advance Auto Parts
Autolite
Autolite Copper Resistor Spark Plug: Quick Starts & Enhanced Durability, 3924
MPN 3924
$5.49
Advance Auto Parts
Autolite
Autolite Double Platinum Spark Plug: Enhanced Durability & Performance, APP3924
MPN APP3924
$7.49
Advance Auto Parts
Autolite
Autolite Platinum Spark Plug (AP3924): Improved Performance & Durability
MPN AP3924
$5.49
Advance Auto Parts
Autolite Iridium
Autolite Iridium Iridium XP Fine wire Spark Plug: Improved Durability, More Focused Ignition, XP3924
MPN XP3924
$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 Double Platinum Power Spark Plug RC11PYPB4 - Enhanced Durability & Performance, 7070
MPN 7070
$7.49
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 RC12WYPB4 - Maximum Performance & Longevity, 9201
MPN 9201
$10.99
Advance Auto Parts
Champion
Champion Platinum Power Spark Plug RC10PYC - Powerful Performance & Longevity, 3346
MPN 3346
$5.49
Advance Auto Parts
Champion
Champion Platinum Power Spark Plug RC12PYC - Powerful Performance & Longevity, 3071
MPN 3071
$5.99
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, SK20PR-L11, 3443
MPN 3443
$18.49
Advance Auto Parts
Motorcraft
Motorcraft Double Platinum Spark Plug: Enhanced Durability & Reliability, SP-485
MPN SP-485
$4.79
Advance Auto Parts
Motorcraft
Motorcraft High-Durability Spark Plug: Reduces Misfires & Fuel Consumption, SP-485-X
MPN SP-485-X
$9.99
Advance Auto Parts
Motorcraft
Motorcraft High-Performance Spark Plug: Enhances Fuel Efficiency & Reliability, SP-497-X
MPN SP-497-X
$6.99
Advance Auto Parts
Motorcraft
Motorcraft Platinum Spark Plug: Enhances Durability & Reduces Fuel Consumption, SP-497
MPN SP-497
$7.79
Advance Auto Parts
NGK
NGK G-Power Platinum Spark Plug (BKR5EGP): Enhanced Durability & Efficiency, 7090
MPN 7090
$8.99
Advance Auto Parts
NGK
NGK G-Power Platinum Spark Plug (BKR6EGP): Enhanced Durability & Efficiency, 7092
MPN 7092
$8.99
Advance Auto Parts
NGK
NGK Iridium IX Spark Plug (BKR5EIX-11): Extreme Ignitability & Durability, 5464
MPN 5464
$13.99
Advance Auto Parts
NGK
NGK Iridium IX Spark Plug (BKR6EIX-11): Enhanced Ignitability & Durability, 3764
MPN 3764
$14.99
Advance Auto Parts
NGK
NGK Laser Iridium Spark Plug (IFR5E11): Fine Wire Tip for Efficiency, 7994
MPN 7994
$23.99
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 Ruthenium HX Spark Plug (FR5BHX): High Ignitability & Durability, 96457
MPN 96457
$16.99
Advance Auto Parts
NGK
NGK Ruthenium HX Spark Plug (FR6BHX-S): High Ignitability & Durability, 95159
MPN 95159
$19.49
Advance Auto Parts
NGK
NGK Standard Nickel Spark Plug (BKR5ES-11): Reliable OE Performance, 2382
MPN 2382
$5.99
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 (BKR5E-11): Reliable Ignitability & Smooth Idle, 6953
MPN 6953
$7.49
Advance Auto Parts
NGK
NGK V-Power Nickel Spark Plug (BKR6E-11): Reliable Ignitability & Performance, 2756
MPN 2756
$7.49Spark 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.