How Often Should I Change The Spark Plugs on My Subaru?

Spark plugs are one of those engine components that often fly under the radar, but they play a key role in your Subaru’s overall performance. These small parts are responsible for igniting the air-fuel mixture inside the engine, which keeps your car running smoothly. In this article, we’ll cover the purpose of spark plugs, the importance of having them replaced, and how often you should consider having yours changed!

What Are Spark Plugs?

Before we get into the replacement schedule, it’s important to understand why spark plugs are so vital. In simple terms, spark plugs deliver the spark that ignites the air-fuel mixture inside your engine’s cylinders, which creates the power used to move your vehicle. Without a strong spark, your Subaru’s engine wouldn’t be able to produce proper combustion.

Despite being simple and long-lasting components, spark plugs will still naturally wear out over time and eventually fail if not replaced. Even a single failing plug can cause issues such as poor fuel efficiency, engine misfires, and rough idle. Having your spark plugs changed on schedule is vital to avoid these symptoms and any potential damage. 

How Often Should You Replace the Spark Plugs on Your Subaru?

The recommended replacement interval for spark plugs can vary depending on the model and year of your Subaru. In general, Subaru recommends replacing the spark plugs around every 60,000 to 100,000 miles for most newer models equipped with platinum or iridium spark plugs. These types of plugs tend to last longer and maintain better performance over time.

For older Subaru models or those using copper spark plugs, the replacement interval is typically a bit shorter, usually around 30,000 to 50,000 miles. Copper plugs wear out more quickly than platinum or iridium plugs and may need to be replaced more frequently.

For the most accurate information, always refer to your Subaru’s owner’s manual, which will have specific recommendations based on your vehicle’s year and engine type.

Signs That You Need to Replace Your Subaru’s Spark Plugs

While sticking to the recommended replacement schedule is essential, it’s also important to pay attention to warning signs that your spark plugs may need attention earlier than expected. Here are a few symptoms of worn-out spark plugs:

• Rough Idling: If your Subaru feels like it’s shaking or idling unusually when stopped at a light, it could be a sign of spark plug issues. Worn plugs may cause the engine to misfire or run unevenly, leading to vibrations throughout the vehicle.
  
• Decreased Acceleration: If you notice that your Subaru’s acceleration feels sluggish or unresponsive, it could be because the spark plugs aren’t delivering an adequate spark, which reduces engine power.
  
• Poor Fuel Economy: Spark plugs that are past their prime can lead to incomplete combustion, causing your engine to burn more fuel than necessary as some gets left over. If your gas mileage drops unexpectedly, worn spark plugs could be to blame.
  
• Check Engine Light: An active check engine light could be warning you of a misfire or other engine issues related to spark plugs issues. 

If you experience any of these symptoms, it’s a good idea to have your spark plugs inspected by a trusted mechanic as soon as possible to avoid further engine issues.

Subaru Engine Diagnostics & Services in Tucson

Changing the spark plugs on your Subaru is an essential part of regular vehicle maintenance, and it’s always important to listen to your vehicle and watch for signs that may indicate it’s time for a change sooner. Regular spark plug maintenance not only improves engine performance but also enhances fuel efficiency and prevents expensive repairs.

If you’re unsure when to replace your spark plugs or if you notice any of the warning signs mentioned above, don’t hesitate to give us a call or schedule online with the experienced technicians here at Micro Import Service in Tucson! Our team has extensive training on all Subaru platforms and will ensure your spark plugs are in proper condition to keep you driving.