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How often should you change spark plugs? Every 30,000 to 90,000 miles

How often should you change spark plugs? Every 30,000 to 90,000 miles

It is crucial to understand “how often should you change spark plugs?” To maintain your vehicle's efficiency. Typically, your spark plugs are expected to fail between 30,000 and 90,000 miles. However, you must keep an eye for any symptoms indicating prematurely failing spark plugs to place them before hitting the 30,000-mileage threshold.

Auto Repairs Are EXPENSIVE

Although your vehicle has major components that need to be working properly, there are some minor components that your vehicle won't start without them. For instance, the spark plugs are responsible for generating the initial spark to ignite the air-fuel mixture. Without a working spark plug, your car won't simply start.

Understanding how often you should change spark plugs is extremely critical to help maintain a good working engine and prevent sudden breakdowns. This article provides you with all details you need to know about spark plugs replacement frequencies, and it also highlights some of the common symptoms indicating failing spark plugs before you approach the typical expiration threshold.

What is the spark plug, and what does it do it?

The spark plug is a minor component in any vehicle equipped with a combustion system. It emits a spark of electricity came to a small gap to ignite the air-fuel mixture once it reaches very high pressure and temperature. Your vehicle won't simply run without the spark plug because the engine won't create any energy.

Not all spark plugs are the same because there are a variety of materials that you can come here. For instance, there are copper, Iridium, platinum, double platinum, and silver spark plugs. Every spark plugs type comes with its characteristics and provides you with different benefits. But, of course, the more the benefits, the higher the price and the longer the lifespan.

How often should you change spark plugs?

Overtime abuse, the spark plugs are expected to fail out, requiring replacement. If you ignored a faulty spark plug, you would end up without a working engine at any time, even if there is no health nearby.

Typically, spark plugs are expected to fail closer to 30,000 miles or sometimes 90,000 miles depending on the type of sparkplug material. However, it is recommended that you never wait until hitting the 30,000 miles threshold because the spark plugs might fail prematurely, which means that you must keep an eye on symptoms indicating a failed spark plug and replace it when necessary.

What are the symptoms of bad spark plugs?

As we indicated earlier, while there is a typical threshold where the spark plugs are expected to fail, you'll still have to pay attention to any symptoms or signs indicating a bad spark plug. Let's take a closer look at some of the common symptoms that you might encounter telling you that your spark plugs are failing or about to fail:

1-    Rough idling

What are the most common symptoms indicating that the spark plugs are filling or about to fail when dealing with rough idling. First, you end it should run smoothly. Second, whenever you realize issues with idling, you should perform a thorough inspection to determine the real culprit. Keep in mind that many culprits could cause idling, so you can't immediately replace the spark plugs thinking that this will resolve the issue.

2-    Difficulty starting

Typically, your vehicle won't start properly if there's a problem with the starting system, including the battery, the starter, the alternator, etc. However, in some instances, if the spark plug is not working properly, you'll have difficulty starting the car, and you will realize that some of the minor electric components are working, but the engine can't crank.

3-    Engine misfiring

Your engine requires a specific amount of air to fuel mixture along with a required spark at the right timing to get to work. Therefore, when one or more of the mentioned elements does not exist, you'll engine well deal with misfiring. For example, if the spark plug is not working properly, the engine won't receive the right spark at the right time, and therefore, you'll notice that the engine shows some signs of misfiring.

4-    Engine surging

Similar tool misfiring and difficulty starting, when the engine is under stress, and when the spark is not provided at the right timing, you'll deal with some weird behaviors of your engine shown up in the form of engine surging. Again, this might impact the fuel economy and the overall performance of the engine.

5-    Reduction in the fuel economy

Also, working properly will realize that there is a significant reduction in the fuel economy. When the air-fuel mixture doesn't receive the right spot at the right time, part of the air-fuel mixture won't ignite properly, and that's when your engine will request additional fuel to generate more energy. The more fuel your engine requests, the more fuel your vehicle consumes, and the more you'll need to visit the gas station.

6-    Troubles with acceleration

Finally, when the engine doesn't generate the necessary energy every time it air with fuel, your vehicle generates the right acceleration. Every time you hit the gas pedal, your vehicle will hesitate to accelerate.

Should I change spark plugs every year?

It depends. As we indicated earlier, the spark plug expected failure threshold is typically by mileage, not time. Therefore, it will all depend on how many miles you put on your car per year. For instance, if your vehicle spark plug is made of copper and you're expecting to put more than 30,000 miles a year, you might want to change the spark plugs before you hit the end of the year.

Do new spark plugs make your car faster?

No, installing new spark plugs won't necessarily increase the speed of your car or its horsepower. Instead, you'll notice some improvement in the vehicle efficiency, but it's not going to be as massive to be noticeable in terms of the faster vehicle.

Even if the spark plugs are in bad condition and we decided to go with the highest quality spark plugs, which is the iridium spark plugs, you won't sell to increase the vehicle speed.

How much does it cost to replace spark plugs?

Typically, to replace the spark plugs, expect to pay between $16.00 and $100. However, you will also need to add the labor costs are somewhere between $40 and $150. That's why if you're planning could save slightly on spark plugs; you might consider having them replaced by an independent shop versus going to a dealership, which is much higher for labor costs.

Keep in mind that spark plugs are not the same, and there are a variety of materials that you can choose from, which means that depending on the material you decide to go with, the price can differ significantly.

Is it bad to change spark plugs often?

There's no clear answer for this question because all research out there mentions you shouldn't wait on your old spark plugs more than somewhere between 30,000 miles and 90,000 miles. However, no research or statistics were published regarding the frequency of changing spark plugs and their impact on your vehicle.

The bottom line is it won't matter how often you change the spark plugs if you don't exceed the maximum mileage threshold.

2021-2022 best spark plugs in the market

If you realize that it's now the time to replace your spark plugs, you'll find a long list of spark plugs available in the market from the same type. In other words, it can be a little bit overwhelming for you to choose the best spark plug that works for your vehicle.


The good news is that many automotive experts put together lists of the top and best spark plugs. Our team conducted a detailed review of all these lists and provided you with a 2021-2022 update regarding the best spark plugs that you should consider for your next replacement:

  • NGK Iridium IX Spark Plugs
  • Denso PK20TT Platinum Spark Plugs
  • Bosch ZGR6STE2 Copper with Nickel Spark Plug
  • Bosch X5DC Copper with Nickel Spark Plug
  • NGK ZFR6F11 V-Power Spark Plug
  • Acdelco 1 Professional RAPIDFIRE Spark Plug
  • Champion Copper Plus C33-438 Spark Plug
  • Motorcraft SP546 Spark Plug
  • NGK Laser Platinum PZFR5F-11 Spark Plug
  • Denso SK20R11 Iridium Spark Plug
  • Bosch Double Iridium OE Replacement Spark Plug

What benefits do I get from changing the spark plugs?

When changing the spark plugs, you will prevent major breakdowns. However, if you decide to upgrade your spark plugs, you'll achieve additional benefits, including:

1-    Enhancing the vehicle's performance

Some spark plugs are designed using specific material that withstands extreme conditions and provides you with the best performance. These spark plugs are made of Iridium material, perfect for improving the field economy and enhancing horsepower.

2-    Improving the vehicles fuel economy

When you use a perfectly running spark plug, you'll enhance the fuel economy by allowing the engine to receive the right spark at the right time without requiring too much voltage, especially if you go with a higher quality spark plug.

3-    Reducing exhaust emissions

When the spark plugs are in good condition, there's a low chance that your vehicle will deal with misfiring. When there is no misfiring, your vehicle won't emit very harmful gases into the atmosphere, which means you'll have fewer exhaust emissions. This is a great feature you'll achieve because it ensures that your car passes the emission test.

4-    Enhances your vehicle's acceleration

If you've been dealing with sluggish acceleration recently because of an old sparkplug, you'll realize that whenever you replace them, things will improve immediately. Your vehicle will be more responsive, and it will be better at acceleration.

5-    Improving the engine idling

As we indicated earlier, one of the worst things you'll deal with when the spark plugs are not working properly is rough engine idling. Therefore, immediately after replacing the spark plugs with good ones, you'll see a significant improvement in the vehicle’s performance, especially at idling.


Although the spark plugs are minor components in your combustion system, your engine won't run without these spark plugs, and the combustion process won't start at all. Therefore, you must maintain good working spark plugs all the time to enjoy your vehicle and prevent sudden breakdowns.

One of the most important questions that you must ask yourselves when maintaining the spark plugs is, “how often should you change spark plugs?” Typically, spark plugs are expected to fail somewhere closer to 30,000 miles for 90,000 miles depending on the spark plug type.

However, you must pay attention to some of the symptoms of bad spark plugs, including rough idling, difficulty starting, engine surging, engine misfiring, troubles with fuel consumption, acceleration issues.

No matter how much effort you put towards taking care of your spark plugs, if there is a major internal problem with your engine or the transmission, you must calculate the total repair costs and compare them to your vehicle's value. When you notice that repair costs are getting close to 75% or more of your car's total value, you'd better sell the vehicle and use its money to purchase a better car.

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