Skip to content
Home » 2015 STI Spark Plug Socket Size Guide

2015 STI Spark Plug Socket Size Guide

    2015 STI Spark Plug Socket Size

    Overview

    If you own a 2015 Subaru WRX STI and are looking to change the spark plugs yourself, it’s important to know the correct socket size to use. Using the wrong size socket can damage the spark plug and make the task more difficult. In this article, we will provide you with the spark plug socket size for the 2015 STI model.

    Spark Plug Socket Size Chart

    To make it easier for you to find the correct spark plug socket size, we have compiled a chart below:

    Model Engine Socket Size
    2015 STI 2.5L Turbocharged 5/8″ (16mm)

    Steps to Change Spark Plugs

    If you’re planning to change the spark plugs in your 2015 STI, follow these steps:

    1. Make sure the engine is cool before starting.
    2. Locate the spark plug wires or ignition coil packs, depending on your specific model.
    3. Remove the wire or coil pack from the first spark plug by gently pulling it straight out.
    4. Using the correct spark plug socket size (5/8″ or 16mm), attach it to a ratchet or extension.
    5. Insert the socket onto the spark plug and turn it counterclockwise to loosen and remove the old spark plug.
    6. Inspect the spark plug for any signs of damage or wear. If necessary, replace it with a new one of the same type and gap size.
    7. Apply a small amount of anti-seize compound to the threads of the new spark plug.
    8. Hand-tighten the new spark plug into the cylinder head, and then use the spark plug socket and ratchet to tighten it further. Be careful not to overtighten.
    9. Reattach the spark plug wire or coil pack to the spark plug.
    10. Repeat the above steps for each spark plug, one at a time.

    Conclusion

    Knowing the correct spark plug socket size for your 2015 STI is essential when performing maintenance tasks like changing spark plugs. By following the steps outlined in this article and using the appropriate socket size, you can ensure a smooth and successful spark plug replacement process. Remember to always consult your vehicle’s manual for specific instructions and torque specifications. Happy wrenching!