Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2002LEGACY GT WAGON AWD F4-2.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGTECHNICAL SERVICE BULLETINSIGNITION SYSTEM - SPARK PLUG REPLACEMENT INTERVALS
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHC
Ignition System - Spark Plug Replacement Intervals
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHCSECTION Ignition System - Spark Plug Replacement Intervals
PLATINUM SPARK PLUG CHANGE INTERVALS
The Techline occasionally gets calls concerning the change intervals on platinum plugs and why some need to be changed at 30,000 miles and others at 60,000 miles. The reason for this is the spark plugs on 2.5L NA engines, the electrode side of this plug is platinum but the plug core side is not platinum. Therefore, it is a maintenance interval every 30,000 miles. On the 2.5L Turbo and 3.OL engines, both the electrode side and the plug core side are platinum. Therefore, it is a maintenance interval every 60,000 miles.
The Techline occasionally gets calls concerning the change intervals on platinum plugs and why some need to be changed at 30,000 miles and others at 60,000 miles. The reason for this is the spark plugs on 2.5L NA engines, the electrode side of this plug is platinum but the plug core side is not platinum. Therefore, it is a maintenance interval every 30,000 miles. On the 2.5L Turbo and 3.OL engines, both the electrode side and the plug core side are platinum. Therefore, it is a maintenance interval every 60,000 miles.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.