How often should I change the spark plugs on my Subaru Legacy?
As a general rule, you should change the spark plugs on your Subaru Legacy every 60,000 to 100,000 miles, or every 4-6 years, whichever comes first. Proper spark plug maintenance is crucial for maintaining your vehicle's performance, fuel efficiency, and overall engine health.
Why Changing Spark Plugs is Important
Spark plugs are responsible for igniting the air-fuel mixture in your Subaru Legacy's engine, which is essential for the engine to run. Over time, the spark plugs can become worn or fouled, leading to misfiring, reduced fuel efficiency, and even engine damage if left unchecked. Regularly replacing the spark plugs helps ensure your Subaru Legacy's engine is running at its best.
Factors that Affect Spark Plug Lifespan
- Driving Conditions: Vehicles driven in harsh conditions, such as frequent towing, off-road use, or in extreme temperatures, may require more frequent spark plug replacement.
- Engine Type: Some Subaru Legacy engines, such as turbocharged or high-performance models, may have shorter spark plug lifespan compared to standard engines.
- Fuel Quality: Using lower-quality fuel can lead to faster spark plug fouling and degradation.
- Maintenance History: Proper maintenance, such as regular tune-ups and oil changes, can help extend the lifespan of your Subaru Legacy's spark plugs.
It's important to consult your Subaru Legacy's owner's manual or a qualified mechanic for the recommended spark plug replacement interval, as it may vary depending on your specific model and driving conditions.
Signs Your Subaru Legacy Needs New Spark Plugs
Here are some common signs that your Subaru Legacy may need new spark plugs:
- Decreased Fuel Efficiency: Worn or fouled spark plugs can cause your Subaru Legacy 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 Legacy to start, especially in cold weather.
- Check Engine Light: The check engine light may illuminate if there's an issue with the spark plugs or the ignition system.
If you notice any of these signs, it's a good idea to have your Subaru Legacy's spark plugs inspected and replaced as needed by a qualified mechanic.
How often do Subaru spark plugs?
about every 60,000 miles
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.
How much does it cost to replace spark plugs on a Subaru Legacy?
| Car | Service | Estimate |
|---|---|---|
| 2000 Subaru LegacyH4-2.5L | Service typeSpark Plug Replacement | Estimate$343.99 |
| 1999 Subaru LegacyH4-2.5L | Service typeSpark Plug Replacement | Estimate$398.23 |
| 2011 Subaru LegacyH4-2.5L Turbo | Service typeSpark Plug Replacement | Estimate$489.62 |
| 2018 Subaru LegacyH6-3.6L | Service typeSpark Plug Replacement | Estimate$930.83 |
Should I replace spark plugs at 60k 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.
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.
How do I know when to replace my spark plugs?
Signs of Bad Spark Plugs
- Your check engine light comes on. Worn/failed spark plugs, coil packs, or spark plug wires can trigger your check engine light to come on.
- Engine misfires.
- Your car has trouble starting.
- Bad gas mileage.
- The engine idles roughly (and you can hear it!)
- Your car won't accelerate quickly.
What mileage do you change spark plugs on a Subaru?
Experts generally recommend replacing spark plugs every 30,000 miles for the best results. If one of your Subaru spark plugs gets out of whack, it can cause a reduction in gas mileage and engine problems later on.
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.
When to change spark plugs on a Subaru Legacy?
A good set of current-production spark plug wires generally can last about 30,000 miles, but they can wear out sooner depending on the general climate where you live and how often you drive. When spark plugs outlast the wires that send them the power, then your vehicle will act like it has bad spark plugs.
What symptoms may indicate my vehicle's spark plugs need replacing?
Signs of Bad Spark Plugs
- Your check engine light comes on. Worn/failed spark plugs, coil packs, or spark plug wires can trigger your check engine light to come on.
- Engine misfires.
- Your car has trouble starting.
- Bad gas mileage.
- The engine idles roughly (and you can hear it!)
- Your car won't accelerate quickly.
Will my car run better if I change the spark plugs?
Over time, spark plugs may become clogged or damaged, resulting in decreased engine performance. Changing your spark plugs can help to keep your engine running smoothly and efficiently. In addition, they can also help to improve fuel economy and reduce emissions.
