How often should you change spark plugs on a Subaru?
The recommended spark plug replacement interval for most Subaru vehicles is every 60,000 to 100,000 miles, depending on the specific model and driving conditions. However, it's important to consult your owner's manual or a qualified mechanic to determine the optimal replacement schedule for your Subaru.
Understanding Spark Plug Replacement for Subarus
Spark plugs are a critical component in the ignition system of your Subaru's engine. They are responsible for providing the electrical spark that ignites the air-fuel mixture in each cylinder, allowing the engine to run. Over time, spark plugs can become worn or fouled, which can lead to decreased engine performance, reduced fuel efficiency, and even engine misfiring.
Subaru generally recommends replacing spark plugs every 60,000 to 100,000 miles, depending on the specific model and driving conditions. However, this is a general guideline, and the actual replacement interval may vary based on factors such as:
- Driving Conditions: Vehicles used for towing, hauling heavy loads, or driven in extreme temperatures or dusty environments may require more frequent spark plug replacement.
- Fuel Quality: Using lower-quality fuel can cause spark plugs to become fouled more quickly, necessitating earlier replacement.
- Engine Modifications: Subarus with aftermarket engine modifications, such as turbochargers or performance upgrades, may require more frequent spark plug replacement.
It's important to consult your Subaru's owner's manual or a qualified mechanic to determine the optimal spark plug replacement interval for your specific vehicle and driving conditions.
Signs That Your Subaru Needs New Spark Plugs
There are several signs that your Subaru may need new spark plugs, including:
- Decreased Fuel Efficiency: Worn or fouled spark plugs can cause your Subaru to use more fuel than normal.
- Rough Idling or Misfiring: Faulty spark plugs can cause the engine to misfire, leading to a rough or uneven idle.
- Difficulty Starting: Worn spark plugs can make it harder for your Subaru to start, especially in cold weather.
- Check Engine Light: The check engine light may illuminate if there are issues with the spark plugs or the ignition system.
If you notice any of these signs, it's a good idea to have your Subaru's spark plugs inspected and replaced if necessary.
Conclusion
Properly maintaining your Subaru's spark plugs is essential for ensuring optimal engine performance, fuel efficiency, and reliability. By following the recommended replacement interval and being aware of the signs that new spark plugs are needed, you can help keep your Subaru running at its best for years to come.
How do I know when my spark plugs need replacing?
Here are seven signs that are telling you that you need spark plug replacement on your vehicle.
- Your Vehicle is Difficult to Start.
- Your Engine is Misfiring.
- You Have Poor Fuel Economy.
- Your Engine Idles Rough.
- Your Car Doesn't Accelerate Easily.
- Your Engine is Loud.
- Your “Check Engine” Light Comes On.
How long do Subaru spark plugs last?
While the answer depends on the make and model of your vehicle, as a good example, the newest Subaru BOXER® engines are built with spark plugs made of ultra resilient materials, such as platinum. This allows them to be replaced about every 60,000 miles.
What are the symptoms of old spark plugs?
Your driving habits also play a crucial role in spark plug wear. If your car shows any of the faulty spark plug symptoms mentioned earlier, such as difficulty starting, rough idling, decreased fuel efficiency, or misfires, it's a sign you need to replace your spark plugs.
What are the signs of a bad spark plug?
What are the signs your Spark Plugs are failing?
- Engine has a rough idle. If your Spark Plugs are failing your engine will sound rough and jittery when running at idle.
- Trouble starting. Car won't start and you're late for work… Flat battery?
- Engine misfiring.
- Engine surging.
- High fuel consumption.
- Lack of acceleration.
Can spark plugs last 10 years?
Even if you're not having problems, you'll still want to change spark plugs out at every 30,000-mile interval. For most drivers, that will mean that you're due for spark plug service once every 2-3 years!
Can spark plugs last 200,000 miles?
Older cars often had to have their spark plugs replaced every 5,000 to 10,000 miles, while some newer cars — with computer controls and more modern plugs — can go more than 100,000 miles on a set of plugs. As is often the case, the best source of service information for your vehicle is the owner's manual.
Why replace spark plugs at 60,000 miles?
If it's a lifetime spark plug or one that can last up to 100,000 miles, it may be a good idea to replace them at 50,000 or 60,000 miles. Based on the metal the cylinder head and spark plugs consist of, they could seize inside the cylinder head and you won't be able to get them out.
How do I know if my Subaru spark plugs are bad?
One of the first signs of spark plug wear is trouble starting your Subaru. If the engine cranks longer than usual before starting or if you experience intermittent starting issues, it's time to inspect your spark plugs.
How often do spark plugs need to be replaced on a Subaru Outback?
around 30,000 miles
Keeping Your Subaru in Prime Condition
The plugs in your ignition might be small, but they pack a punch when it comes to performance. They usually need to be replaced around 30,000 miles, but if you frequently tackle tough conditions or take long trips, you might need to swap them out a bit sooner.
What happens if I don't change spark plugs?
When it happens, it can cause the engine to run rough and can even decrease fuel economy. In extreme cases, it can even cause engine damage. Fouling is another problem that can occur if you don't change your spark plugs. It happens when the spark plugs get covered in carbon deposits, oil, or fuel.
