10 Best Spark Plugs: Copper, Platinum, Iridium & Silver

Jerry Wilson
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At one point or another, you may find yourself pondering over spark plugs.

You may have heard all the fuss about them but don’t know anything about them. You’ve seen them around but aren’t quite sure what they are. Where do they go? How do they work? What are the best spark plugs on the market? Are they worth it?

Well, don’t worry.

We’ll walk you through the process of buying spark plugs, help you make sense of the confusing spark plug landscape, and lead you in the direction of the best spark plugs for your bike.

Check out these 10 best spark plugs if you want to crack into this frequently asked, but confusing, question.

NameCategoryProduct
NGK 7090 BKR5EGP G-Power Spark PlugBest OverallNGK 7090 BKR5EGP G-Power Spark Plug
Autolite APP104 Double Platinum Spark PlugBudget PickAutolite APP104 Double Platinum Spark Plug
8 PCS NEW –Upgrade Pick8 PCS NEW -

1. NGK 7090 BKR5EGP G-Power Spark Plug

Our rating: 9 / 10

NGK 7090 BKR5EGP G-Power Spark Plug

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Pros:

  • NGK’s top-seller
  • Widely trusted for reliability and longevity
  • Great price

NGK has been the leading car parts maker for over 90 years, and like their quality, the NGK 7090 BKR5EGP G-Power Spark has the same outstanding performance and the same reliable technology as the rest of their spark plugs. This plug comes as standard equipment in many fuel-efficient vehicles, and is great for your everyday gas-sipping car.

Its platinum tip can last for about 50,000 miles. While the ordinary plug unleashes an aggressive spark and comes with a voltage rating of 16, this plug comes with a voltage rating of 14. This small change in power keeps the engine at its most economical rev levels and saves you gas in the long run.

The seven-booted C-clip is easy to replace and ensures smooth starts and consistent ignition and acceleration. What’s amazing is that all this comes with a quality you can trust constantly.

2. Denso

Our rating: 9 / 10

Denso

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Pros:

  • Highly durable
  • Good price
  • Made in Japan

Cons:

  • Cobalt silver center electrode
  • Not iridium tipped like a few other options

Denso offers a number of spark plug options to fit different vehicles, climates and driving. Here, we’re covering their platinum, iridium and copper spark plugs.

This C4 spark plug is specifically designed for use in cold weather; Alaska, Canada, etc. It’s not only made for use in extreme cold, but is designed to help your car start quicker in the cold. Our tests indicated that the Denso plug got your car started much faster in cold weather than other options in our review. There are a number of other benefits to this spark plug and why it’s one of our favorites. The Denso spark plug is the only one with a platinum lightning bolt on it. A platinum tip spark plug is one which features a platinum looking tip which performs as well as a normal platinum spark plug.

These plugs are available in a number of different grades of platinum. You can buy platinum for colder climates, platinum for summertime (but still cold) and multi-temp which is platinum for warm and cold weather. You will need to make sure you purchase the correct grade of spark plug for your area.

3. ACDelco 41-101 Professional Iridium Spark Plug

Our rating: 9 / 10

ACDelco 41-101 Professional Iridium Spark Plug

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Pros:

  • Engineered to deliver 22% more voltage output to the spark plug gap and windings, compared to other platinum plugs
  • Feature a patented, diamond-shaped center electrode that integrates a patented metal alloy based on iridium that is at least 10 times as expensive as platinum
  • Reduce wear and fuel inefficiency
  • Create more power output
  • ACDelco 41-101 Professional Iridium Spark Plug is a great replacement for any vehicle and is also designed for a variety of applications in gasoline, diesel, and E85 fueled engines

Cons:

  • A bit more expensive than regular plugs
  • Be sure to replace them every time, even if they look eerily similar to the plugs you just removed

ACDelco’s Professional Iridium Spark Plugs, feature an iridium metal alloy center electrode, which means they are a bit more expensive than your average spark plug.

However, they offer 22% more voltage output to the spark plug gap and windings. This is due to the iridium metal alloy that powers the plug’s patented diamond-shaped center electrode.

And while the iridium fuel enrichment or improving octane rating isn’t an exact science, the ACDelco 41-101 Iridium Spark Plug will improve overall performance of your engine as well as reduce wear in your ignition system.

4. NGK

Our rating: 9 / 10

NGK

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Pros:

  • Iridium tip spark plug
  • Made in Japan
  • High quality with environmentally-friendly materials
  • Low price

A copper core spark plug is the thing that fires the engine in the first place. It’s not as flashy as high-tech bikes, but it’s an essential part of any transportation vehicle that runs on an internal combustion engine. The NGK BKR5EIX-11 is of very high quality and made in Japan, and it packs a punch when it comes to the basics of electricity.

This spark plug uses an iridium tip so that it can make a better connection with the end of the cylinder than other spark plugs. Iridium tips are small and had to be attached to the top of the plug, so they’re only used when it’s really necessary. The spark generated by this tip is more efficient than the one generated by a copper tip and runs cooler for more power and longer life. This thing will help you power up the engine without any worries.

5. Bosch 6702 Platinum Spark Plug

Our rating: 9 / 10

Bosch 6702 Platinum Spark Plug

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Pros:

  • Lasts longer than Iridium plugs
  • Externally threaded for easy installation
  • Can be used for multiple applications
  • Super durable

Bosch is one of the most popular manufacturers of spark plugs on the market, and the way I see it, they have the number one spot well locked down. The 702 plugs are the best spark plugs I have ever used, and I wasn’t left disappointed after using them.

Platinum spark plugs are great for cars with high-rpm engines, or cars that are used for towing and hauling equipment. These plugs have a greater resistance to the heat and higher levels of voltage, ultimately lasting longer than Iridium plugs.

The outer casing is made of metal instead of plastic, which means you will be able to use these plugs on multiple applications without having to replace the whole set. Another lifesaver is that these plugs are made to go head-to-head with any weather, so if your vehicle is parked outside, you won’t have to worry about the plugs rusting or corroding.

6. NGK 6240 PLFR5A-11 Laser Platinum Spark Plug

Our rating: 8 / 10

NGK 6240 PLFR5A-11 Laser Platinum Spark Plug

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Pros:

  • High efficiency
  • Superior performance
  • SMP (Super Metal Plating) technology
  • Devoid of lead
  • Maximized durability

Cons:

  • Expensive
  • Not suitable for heavily modified engines

The NGK Laser Platinum spark plug is designed to optimize your engine’s performance and maintain top-notch efficiency. The Platinum iridium center electrode can provide up to 25% more wear resistance than any other plug in temperatures up to 882°F. In addition, the Laser Platinum reduces gap erosion over the life of the spark plug to improve its service life and overall mileage.

The Laser Platinum is no doubt a premium spark plug, but you get what you pay for: typically, twice the lifetime of an ordinary spark plug. The only caveat is that it is not meant to run in heavily modified engines with extremely high knickknack levels, where extremely high voltage is required, as it can cause power loss. That being said, this spark plug is the best for all engines with sufficient generator support and performance needs.

7. 8 PCS NEW –

Our rating: 8 / 10

8 PCS NEW -

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Pros:

  • Best spark plugs for many cars
  • Ideal for many newer cars
  • Long lasting with great performance
  • Highly dependable and reliable
  • Great for old cars as well
  • Cranks up engine within 5 seconds
  • Economical

Cons:

  • Not ideal for older cars
  • May cause speed limiters on newer cars
  • Longer installation time

The top 10 spark plugs out there are undoubtedly the NGK 3403 G-Power Platinum Alloy Spark Plugs. To start things off, it is the number one brand used in Japan. It is ranked in the top 10 in the USA as well.

These spark plugs are a great choice in my humble opinion. They are highly dependable and reliable and will not let you down. The G-Power platinum spark plugs are the best spark plugs for many cars, including toys, motorcycles, and RVs.

That’s not to say they won’t work in older cars. They will, but they’re more ideal for newer cars as they can throw a speed limiter on the older ones. The long lasting effect and high performance of the NGK 3403 G-Power platinum spark plugs is undeniable. They’re tried and tested by word of mouth, and will last a good several years.

8. Champion RER8ZWYCB4

Our rating: 8 / 10

Champion RER8ZWYCB4

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Pros:

  • Iridium tipped
  • Resists up to 2000 degrees
  • Ideal for gasoline
  • One of the best spark plugs around

Singleshot compression ignition(SI) is the best way to ignite pressurized gases in the cylinder. In SI engines, a part of the combustion process is not able to auto-ignite at a constant rate. This makes auto-ignition even harder. Since a large percentage of spark plugs are made up of a coil that carries an electrical charge, they are able to create a spark at the tip when the electrical terminal is hit by a battery. The spark spreads across the inside of the engine rows which ignites the fuel that has been pumped in. The pressure and heat from the fuel wake up the spark and lights up the fuel before they explode. These are also called valve triggers.

9. Motorcraft SP-515 Spark Plug

Our rating: 8 / 10

Motorcraft SP-515 Spark Plug

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Pros:

  • Copper core
  • Chrome metal shell
  • Long lasting

The Motorcraft SP-515 spark plug is a copper core, CHROME metal shell spark plug that’s ideal for most auto and light truck applications. It is designed with a smaller insulator nose to reduce power loss during ignition and prevent engine misfires.

This spark plug also performs well in low octane fuels. The construction is self-cleaning to help extend the service life and when the spark plug’s core is exposed to a plasma ion stream in the combustion chamber, the high electrical arc removes any contaminants from the plug’s surface that occur during normal engine operation. Last, but not least, this plug works as a good replacement after the use of an anti-seize compound on bolt threads during maintenance.

10. Autolite APP104 Double Platinum Spark Plug

Our rating: 8 / 10

Autolite APP104 Double Platinum Spark Plug

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Pros:

  • Double platinum ignition system
  • Copper core, platinum tip
  • Operates at low temperatures
  • Maintains an even supply of power
  • Designed to be industrial strength

Cons:

  • No silver
  • Higher temperature range
  • Extra heat production leads to a 20% faster burnout rate
  • Higher cost

The Autolite APP104 is my recommended platinum spark plug for your car or truck, as it will give you the ability to go further before you have to get gas.

The Autolite APP104 has the ability to maintain power at low temperatures, which means no more ignition problems on your first trip into the mountains.

The low temperature range means that you can drive in those temperatures and still be able to start your car, not to mention that you won’t have to replace your spark plugs due to exposure to the cold.

Frequently Asked Questions (FAQ)

What is a better spark plug iridium or platinum?

As stated above the differences between platinum and iridium plugs are minimal. Iridium can withstand hotter operation temperatures which is why it is often used in racing applications. Iridium is also more expensive than platinum, but not enough to justify it as the better choice of spark plugs for almost any engine.

Platinum plugs are less prone to fouling, a benefit for regular drivers who find themselves putting in the plugs months after months. They have less electrodes as compared to iridium, but in actual practice, this fact has no effect on performance. They also have finer spark particle sizes, better conductivity, and are easier to use and install. They are also less likely to seize from corrosion than the iridium plugs. Platinum spark plugs are also less expensive than the iridium. They also weigh less than their iridium counterparts.

Are copper spark plugs better than platinum?

Yes, providing you have the right vehicle! As a general rule, copper spark plugs will work better in colder climates where the spark plug is more exposed. For example, the Saturn Ion, which was available in both V6 and 4-cylinder models, used a copper spark plug that performed much better in colder temperatures. Platinum spark plugs tend to require higher operating temperatures to ignite, so they don't work very well in colder climates.

In addition to colder climates, copper spark plugs also perform better when they have a higher operating temperature, while platinum spark plugs tend to perform better at lower temperatures. As a general rule, in a two-car garage in the winter, you'll probably be better off with copper spark plugs.

What's the best spark plug for performance?

The best spark plugs for performance depend on what you intend to use them for. Spark plugs are the central element of the ignition system, where the fuel is burnt to power the engine. They are used in almost every engine model, from vehicles, to airplanes to motorcycles. Some of the most popular uses of spark plugs and the qualities associated with them are listed below:

'Cool-running' spark plugs are designed to operate at high speeds while still being able to function normally in extreme temperatures. They are an excellent choice for racing engines and Street Performance vehicles.

'Long-life' spark plugs are spark plugs that perform equally well in both cold and hot weather. They are however less responsive, so aren't ideal for racing engines.

'High-heat' spark plugs are designed for high-performance engines that frequently reach high temperatures. They are not good for cold weather.

What brand of spark plugs does Toyota use?

Toyota is fairly silent about the spark plugs they use. We do know they occasionally use Denso manufactured spark plugs. From some research, it looks like Denso has the standard plug for Toyota (copper and platinum).

Copper and platinum channels provide more efficient current flow. This helps reduce hydrocarbon emission and prolongs plug life. Some spark plugs even have Iridium or Silver spark plug electrodes which increase the voltage of the spark. This amplifies the energy output of the electronic ignition system.

Nevertheless, there are extra precautions you should take to make sure your Betta is happy and healthy. In this article, we'll discuss what those precautions are and also what you should avoid doing to your Betta.

Conclusion

There are different metals used for spark plugs in different vehicles. After searching through many different internet forums, it seems that copper and platinum were deemed as the best metals for spark plugs. Since copper has the best anti-corrosive and anti-seizing properties, it is one of the first metals used in spark plugs. This may be the reason why copper spark plugs are always recommended.

Our Recommendation

NameCategoryProduct
NGK 7090 BKR5EGP G-Power Spark PlugBest OverallNGK 7090 BKR5EGP G-Power Spark Plug
Autolite APP104 Double Platinum Spark PlugBudget PickAutolite APP104 Double Platinum Spark Plug
8 PCS NEW –Upgrade Pick8 PCS NEW -