Updated at: 15-07-2022 - By: Lucas

Spark plugs are essential engine parts in the automotive industry. They play an important role in the engine’s efficiency and performance by helping to ignite the gasoline.

All that has changed in spark plugs throughout the years is that they have gone from copper to platinum to the more recent ruthenium/iridium plugs.

Internal combustion engines benefit greatly from the use of ruthenium and iridium spark plugs.

Most individuals have a hard time deciding which plug to buy because both are excellent selections. To assist you make a decision, we’ve put together a comparison of ruthenium and iridium spark plugs.

What are ruthenium spark plugs?

Ruthenium Spark Plugs-2

Spark plugs composed of ruthenium, a strong, rare metal that can survive high temperatures, are the newest innovation in this field.

Spark plugs made of ruthenium resist corrosion and wear better than those made of palladium or platinum. This means that your engine will run more effectively and last longer with ruthenium spark plugs installed.

The ignition system uses a ruthenium electrode because of its strong corrosion and oxidation resistance.

This metal is more resistant to corrosion than other metals, such as tungsten or copper. In comparison to Iridium spark plugs, ruthenium has a melting point of 4233°F or 2334°C.

What are iridium spark plugs?

Spark plugs made of iridium are some of the best and most long-lasting on the market. Among all metals, iridium is the most long-lasting and dense. An iridium spark plug will make your engine run cleaner and cooler than ever before.

It can tolerate high engine temperatures and is highly resistant to tearing and abrasion thanks to its excellently high melting point of 4471° F or 2466 °C.

As a precious metal, platinum is more expensive than gold. Iridium, on the other hand, is currently priced at around half what platinum is.

It has been demonstrated that these spark plugs endure up to 120 000 miles or 193000 kilometers, with some delivering efficient performance up to 150 000 miles or 2410000 kilometers depending on the vehicle.

Differences Between Ruthenium Vs. Iridium Spark Plugs

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There are distinctions and similarities between ruthenium and iridium spark plugs, which may be seen when examining the two metals side by side.

In certain ways, they’re superior than the others, even though they all serve the same purpose and are excellent plugs.

Among the most critical variations are:

1. Durability

Ruthenium plugs are fantastic in terms of long-term usability.

NGK claims that spark plugs made of Ruthenium have a longer lifespan than those made of other metals, such as platinum.

Ruthenium-based spark plugs are the newest innovation in automotive technology. Two times as long as iridium electrodes and eight times as long as nickel electrodes, ruthenium electrodes are supposed to extend spark plug life.

In the long run, these plugs could become “lifetime” plugs that never need to be changed because the electrodes are more durable. Furthermore, their flammability improves fuel efficiency, performance, emissions, and acceleration.

In terms of corrosion and oxidation resistance, Ruthenium is superior to iridium. It is claimed that NGK’s Ruthenium plugs can survive for up to 200, 000 miles or 321,000 kilometers.

Iridium spark plugs, on the other hand, are made to endure roughly 120.000 miles or 193000 kilometers.

2. Design

When it comes to appearance, only one style of iridium spark plug is available; nevertheless, there are two styles of ruthenium spark plugs.

Each design, PSPE and DFE, has a specific use in the market. The DFE plug is ideal for non-turbo applications because it decreases discharges and maximizes ignitability in low heat engines. The PSPE, on the other hand, is best suited for turbo and supercharged engine applications.

3. High ignitability

The ignitability of ruthenium plugs is excellent. They guarantee maximal combustion, which ensures faster fuel response, higher acceleration, and complete combustion of the fuels.

The vehicle’s raw gas emissions will be reduced in the first few minutes of operation as a result of the engine’s quicker cold start. Iridium, on the other hand, offers a quicker throttle response and enhances your vehicle’s acceleration profile more quickly. You’ll be able to tell the difference right away.

4. Fuel efficiency

When it comes to spark plugs, modern models are more effective than older models. In terms of fuel efficiency, ruthenium spark plugs are believed to be superior to iridium spark plugs.

However, there is no guarantee that ruthenium spark plugs are superior to iridium ones in this regard. It’s possible that the use of ruthenium spark plugs will improve your car’s fuel efficiency over time because they take less effort to accelerate.

Because of its improved ignition profile, iridium also helps your automobile get better gas mileage on the highway or in the city. In the comparison of these spark plug types, the fuel efficiency rate is therefore unknown.

Are ruthenium spark plugs worth it?

Using ruthenium spark plugs in your car’s engine is one of the finest ways to improve its performance. Ruthenium spark plugs have a longer life expectancy than iridium spark plugs. As a result, ruthenium plugs are an excellent choice if you want your car’s spark plugs to survive longer.

In addition to being more fuel efficient, ruthenium spark plugs are also more durable. Using a ruthenium plug instead of an iridium plug has been shown to boost fuel efficiency by between ten and twenty percent.

If you have a limited budget, Ruthenium is an excellent choice. They’re less expensive than iridium, but you’re still getting a lot of bling for your buck. As a result, ruthenium plugs are an excellent choice because of their high performance and lower cost.

Are iridium spark plugs worth it?

Like Ruthenium, iridium spark plugs have their own disadvantages, such as being more expensive but providing benefits worth considering.

Iridium has a greater melting point than Ruthenium because it contains more platinum. Because of this, the iridium plug is more resistant to corrosion and oxidation than other types of plugs. The iridium spark plug is the ideal option if you want your machine to perform properly for many years.

Additionally, iridium plugs require less voltage than conventional spark plugs. This means that you can run them on low-power engines more effectively.

If you don’t want to invest in an iridium spark plug but still want to get the benefits of one, this is a great option.


I hope you now have a better understanding of the distinctions in ruthenium and iridium spark plugs. Therefore, the spark plug you choose will be based on your own preferences and requirements.

While Iridium spark plugs are more expensive, Ruthenium plugs appear to be more durable, despite Iridium’s higher melting point. The main difference between the two is the price.

If you’re looking for value and performance, both plugs are a terrific choice. There is no harm in picking any of these for your automobile.