How often should I change the spark plugs on my Subaru Legacy?
As a Subaru Legacy owner, keeping your vehicle in top condition is essential for performance, fuel efficiency, and longevity. One of the most common maintenance questions we hear at Kevin's Autos is about spark plug replacement. Spark plugs play a critical role in your engine's combustion process, and replacing them at the right intervals can save you from costly repairs down the road. Let’s dive into how often you should change the spark plugs on your Subaru Legacy and why it matters.
Manufacturer Recommendations for Spark Plug Replacement
Subaru recommends replacing the spark plugs on most Legacy models every 60,000 to 100,000 miles, depending on the type of spark plugs used and the specific model year of your vehicle. Modern Subaru Legacies often come equipped with long-lasting iridium or platinum spark plugs, which can last closer to the 100,000-mile mark. However, older models or those with copper spark plugs may require replacement closer to 60,000 miles.
Signs That Your Spark Plugs May Need Replacement
Even if you haven’t reached the recommended mileage, your spark plugs may need attention sooner. Here are some common signs that it’s time to replace them:
- Engine Misfires: If your engine stumbles or hesitates during acceleration, worn spark plugs could be the culprit.
- Reduced Fuel Efficiency: A sudden drop in gas mileage may indicate that your spark plugs aren’t firing efficiently.
- Difficulty Starting the Engine: Faulty spark plugs can make it harder to start your car, especially in cold weather.
- Rough Idling: If your engine feels rough or shaky while idling, it’s worth checking the spark plugs.
- Check Engine Light: A misfire or ignition issue can trigger the check engine light, which may point to spark plug problems.
Why Regular Spark Plug Maintenance Is Important
Replacing your spark plugs at the recommended intervals ensures that your Subaru Legacy runs smoothly and efficiently. Here’s why it’s crucial:
- Improved Performance: Fresh spark plugs provide a strong, consistent spark, which leads to better engine performance.
- Enhanced Fuel Economy: Worn spark plugs can cause incomplete combustion, wasting fuel and reducing mileage.
- Preventing Engine Damage: Ignoring spark plug maintenance can lead to misfires, which may damage your engine over time.
- Lower Emissions: Properly functioning spark plugs help reduce harmful emissions, keeping your car eco-friendly.
Tips for Spark Plug Maintenance
To keep your Subaru Legacy in peak condition, follow these tips:
- Stick to the Schedule: Follow the manufacturer’s recommended replacement intervals based on your model year and spark plug type.
- Use Quality Parts: Always use OEM (Original Equipment Manufacturer) spark plugs or high-quality aftermarket options designed for your Subaru Legacy.
- Inspect Regularly: During routine maintenance, ask your mechanic to inspect the spark plugs for wear or damage.
- Address Issues Promptly: If you notice any signs of spark plug trouble, don’t wait—schedule a service appointment right away.
Conclusion
Regular spark plug maintenance is a small investment that can make a big difference in your Subaru Legacy’s performance and longevity. If you’re unsure about the condition of your spark plugs or need assistance with replacement, Kevin’s Autos is here to help. With years of experience in car maintenance and repair, we’ll ensure your vehicle gets the care it deserves. Schedule an appointment today and keep your Subaru running like new!
Frequently Asked Questions
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 |
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.
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.
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.
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.
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.
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 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.
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.
