BPR5ES Vs. BPR6ES – How Do They Differ?

Spark plugs are a vital component of a vehicle’s ignition system. More importantly, choosing the appropriate type of spark plug will determine your engine’s performance capacity.

This review addresses the subtle difference between BPR5ES Vs. BPR6ES spark plugs. By the end of this article, you should be able to identify the thin line between the two spark plugs.

The subsequent sections of this post will unveil virtually everything you need to know about BPR5ES and BPR6ES spark plugs, starting with a comparison table for a basic summary. So, grab a seat while I uncover all you need to know.

bpr5es vs bpr6es

Comparison table between the BPR5ES and BPR6ES spark plugs

These spark plugs differ primarily in their heat range, electrode size, and the engines they are best suited for. Both feature a copper core and are manufactured by NGK. Here is a comparison table between the BPR5ES and BPR6ES spark plugs:

Heat Range 5-Hotter 6-Colder
Electrode size 2.5 mm 2.5 mm
Thread Diameter 14 mm, 19 mm 14 mm, 19 mm
Engine Compatibility Typically used in older engines or engines that operate at lower temperatures. It is commonly used in newer engines or engines that run at higher temperatures.
Performance Suitable for preventing pre-ignition in engines prone to running hot. Helps in preventing fouling in engines that don’t reach high operating
Material Copper Core Copper Core (thicker than BPR5ES)
Manufacturer NGK NGK
Metal Smaller electrodes Nickel-plated shell
Insulator Alumina Ceramic Alumina Ceramic (a bit longer)
Triple Seal Yes Yes (tighter because of the larger sealing washer)
Warranty Standard Manufacturer Warranty Standard Manufacturer warranty
Price More expensive than regular spark plugs Counted among the most expensive

BPR5ES Spark Plug

The BPR5ES spark plug is one of NGK’s popular spark plug models. Being a key player in the automotive industry, NGK produces some of the best spark plugs for a wide range of vehicles and motorcycles.

The BPR5ES is a copper-core spark plug with a nickel alloy electrode. It is strategically designed to provide a reliable and consistent ignition performance. The spark plug is built with a triple-seal design, which helps prevent leakage.

In order to ensure high durability, NGK made the shell of the spark plug from corrosion-resistant steel. Furthermore, the BPR5ES is fashioned to operate optimally at a specific temperature range (typically, a heat range of 5) in order to ensure exceptional engine performance.

The BPR5ES spark plug is a standard plug size, having a thread diameter of 14mm as well as a thread reach of 19mm. The plug is compatible with a wide range of vehicle engines, including those with electronic ignition systems and others that use carburetors.

Many vehicle owners use BPR5ES spark plugs to fight poor fuel economy issues, as well as acceleration and emissions problems.

bpr5es spark plug

Pros of BPR5ES Spark Plug

  • The BPR5ES is built with high-quality materials for an extended lifespan. 
  • High-temperature resistance.
  • Delivers a strong spark for quick ignition.
  • Delivers improved engine performance
  • Wide compatibility for cars, trucks, and motorcycles.
  • Offers better fuel efficiency, smoother acceleration, and reduced emissions.


  • It’s relatively more expensive than most regular spark plugs.
  • Limited availability in the automotive parts market.
  • Requires regular maintenance for performance consistency.

BPR6ES Spark Plug 

The BPR6ES is also a spark plug model manufactured by the famous NGK. This spark plug is built to be used in various types of engines, including small engines like those in generators, lawnmowers, and other power equipment. They are also used in larger engines like those in cars, trucks, and other vehicles.

The BPR6ES spark plug is designed with a copper core electrode. This feature provides excellent conductivity and heat transferability for reliable engine ignition and efficient combustion.

The spark plug has a tapered cut ground electrode that helps to minimize quenching and enhance flame kernel growth for better engine performance. Like BPR5ES, the spark plug also has a thread diameter and a thread reach of 14mm and 19mm, respectively, which makes it fit for a wide range of engine types and models. 

The plug also has a resistor built into the ceramic insulator that helps to minimize electromagnetic interference and noise. The BPR6ES high-quality materials and durable construction style provide exceptional performance and extended service life.

Since they can dissipate a lot of heat efficiently, most high-performance car owners use BPR6ES spark plugs to manage the high level of heat generated by their engines to prevent overheating.

bpr6es spark plug

Pros of BPR6ES Spark Plug

  • The BPR6ES is built with high-quality materials.
  • Delivers reliable performance.
  • Provides an improved ignition spark. 
  • Offers an extended service life.
  • Delivers better fuel efficiency and reduced emissions.
  • Widely compatible with several engine types and models.


  • Relatively costlier than the regular spark plugs in the market.
  • Incompatibility issues with specific vehicles irrespective of the wide range of use. 
  • Possibility of performance limitations in specific vehicles.
  • Requires regular maintenance for consistency in performance.

BPR5ES Vs. BPR6ES Spark Plug Differences

BPR5ES and BPR6ES spark plugs are both manufactured by the famous NGK, a leading part manufacturer in the automotive industry. While the two spark plug models share a couple of similarities, there are still some notable differences between them in the similitude of BPR5ES Vs. BPR7ES.

These slight differences can impact their performance and suitability for different vehicle engines. The following are some of the differences between BPR5ES and BPR6ES with respect to their metal property, insulator, copper core, triple seal, performance, pricing, and warranty.


The BPR5ES and BPR6ES spark plugs are both built with a nickel-plated shell, which helps to provide excellent corrosion resistance and enhance the dissipation of heat. The main difference between the two spark plugs in terms of their metal component is their electrode construction.

The BPR5ES is built with a smaller electrode than its BPR6ES counterpart. This makes the BPR5ES deliver a hotter spark and better ignition. However, the smaller electrode can also result in faster wear and tear on the spark plug.


Both spark plugs are designed with an alumina ceramic insulator that enables them to withstand high temperatures and helps to provide good electrical insulation. However, the BPR6ES insulator is slightly longer than that of the BPR5ES spark plug.

Copper Core

Even though both spark plugs are built with a copper core, which provides excellent conductivity and heat dissipation, the BPR6ES comes with a slightly thicker copper core compared to that of the BPR5ES. This helps to improve its performance in specific vehicle engines.

Triple Seal

Again, while the two spark plugs are built with a triple seal design, which helps to prevent combustion gas leakage and oil seepage, the BPR6ES comes with a slightly larger sealing washer compared to its BPR5ES counterpart. This design helps to create a tighter seal in the BPR6ES.


Generally, the difference in performance between the BPR5ES and the BPR6ES spark plugs is somewhat minimal. However, the BPR6ES may deliver a slightly better performance in specific vehicle engines due to the built-in longer insulator and thicker copper core.


Again, the impact of the longer insulator and thicker copper core on the BPR6ES typically makes it slightly more expensive than its BPR5ES counterpart. While the BPR5ES is more expensive than most regular spark plugs in the automotive industry, it is relatively cheaper than the BPR6ES.


Generally, both the BPR5ES and the BPR6ES spark plugs are sold with a standard manufacturer’s warranty. However, the period and terms of the warranty will largely depend on the supplier in some cases.

What Is The Difference Between NGK BPR5ES And BPR4ES?

NGK BPR5ES and BPR4ES spark plugs are both manufactured by NGK. The two spark plugs are built with several similarities in many ways. However, they also have a couple of vital differences just like BP5ES Vs. BPR5ES.

Firstly, the heat range is one of the main differences between the BPR5ES and BPR4ES spark plugs. While the BPR5ES spark plug has a heat range of 5, the BPR4ES spark plug is built with a heat range of 4. In other words, the BPR5ES can dissipate more heat than its BPR4ES counterpart.

Another notable difference between the BPR5ES and BPR4ES spark plugs is their electrode design. The BPR5ES plug has a U-groove electrode that helps to enhance ignition and minimize fouling. On the other hand, the BPR4ES is built with a standard electrode design.

Therefore, it would be best to use the BPR5ES for better performance, especially in a case where you’re battling a fouling issue.

Lastly, the BPR5ES also has a standard nickel electrode, whereas the BPR4ES spark plugs are fashioned with a fine-wire electrode. This fine-wire electrode is relatively thinner and allows for a larger spark, thereby improving fuel efficiency and engine performance.

Nevertheless, the fine-wire electrode is prone to breaking, especially in the case of high-stress applications.

What Is The Difference Between NGK BP6ES And BPR6ES?

Although NGK BP6ES and BPR6ES spark plugs are manufactured by NGK, the two models come with some discrepancies like the case of BPR5ES 11 Vs. BPR5ES. The heat range is the main difference between the two spark plugs.

The BP6ES spark plug is built with a colder heat range compared to its BPR6ES counterpart, which means that the former is designed with the capacity to dissipate more heat and prevent engine overheating.

In other words, while the NGK BP6ES spark plug is more suitable for high-performance vehicle engines that operate under high RPM or load conditions, the BPR6ES is ideal for vehicle engines that operate under lower RPM or load conditions. 

Can I Use A BPR5ES Instead Of A BPR6ES

If you’re asking, “Can I use a BPR5ES instead of a BPR6ES?” The short answer is

“No.” The BPR5ES spark plug is designed with a lower heat range of 5 compared to the BPR6ES, which has 6; hence it may not be able to dissipate heat as efficiently as the BPR6ES.

In other words, the BPR6ES spark plug is more suitable in high-performance engines that generate a lot of heat due to its ability to prevent overheating. So, if your car’s engine is built to run with BPR6ES spark plugs and you replace them with BPR5ES, you may experience fouling, misfiring, overheating, etc.

Typically, using the spark plug recommended by your vehicle’s manufacturer for your engine is best. If you are not sure of the spark plug to use, ensure to consult your owner’s manual or an expert auto technician.


What spark plug is the same as BPR5ES?

Champion RC12YC and Denso W16EX-U are equivalent to BPR5ES. However, inasmuch as these spark plugs are equivalent with respect to their heat range and physical dimensions, they also have slight differences.

Therefore, it is crucial to stick to the specific spark plug recommended for your vehicle’s engine by the manufacturer. This will help to ensure optimal engine performance and efficiency. 

What is the BPR5ES spark plug used for?

BPR5ES spark plug is used to combat vehicle engine issues that are fuel-related. The spark plug provides faster ignition, as well as enhanced fuel efficiency, smoother acceleration, and minimal emissions.

Generally, the BPR5ES spark plugs come with several advantages. Nevertheless, ensure to consult your vehicle’s manufacturer’s manual to ascertain the best spark plug for you.

What is a substitute for BPR6ES?

Champion RN11YC4, Denso W16EPR-U, and Bosch WR7DC spark plugs are some of the close substitutes for the BPR6ES spark plug.

These spark plugs are also designed with thread size, reach diameter, and capacity to deliver optimum engine performance and efficiency like their BPR6ES counterpart. You can consider one of them if you’re looking for a replacement for your BPR6ES.

Is it OK to mix spark plug types?

Mixing spark plug types is not a good idea as they are manufactured with different specifications and compatibility. Hence, if you combine different spark plug types in your vehicle’s engine, you may experience inconsistent performance and efficiency.

Therefore, it would be best to get a complete match according to the required specifications when replacing your car’s old or faulty spark plugs.

What spark plug is hotter, 8 or 9?

Typically, on NGK spark plugs, the higher the range number, the colder the spark plug, and vice versa. In other words, the lower the range number, the hotter the plug. Therefore, 8 is hotter than 9.

However, the reverse is the case for some spark plug brands (the higher the number, the hotter the plug). If you desire an NGK spark plug to be used in a high-performance vehicle engine, ensure to choose a colder spark plug that can handle the high RPM and loads.

What is the proper gap for BPR5ES?

The proper gap for the BPR5ES spark plug is 0.028 in – 0.030 in (0.70 mm – 0.80 mm). It is essential to state that the gap is a significant factor that determines the performance and efficiency of a spark plug.

If the gap (distance) between the center and side electrodes is too small, you will most likely experience a weak spark, thereby leading to poor engine performance.

Does it matter which spark plug?

You may not have anything to worry about if you’re using another brand of spark plug that matches your original spark plug’s dimensions, heat range, and design.

However, it is always better to consult your car’s manufacturer’s manual to ascertain the spark plugs’ specifications for your internal combustion engine; otherwise, ask a professional auto mechanic.

What does the P stand for in BPR6ES?

The P in BPR6ES stands for “projected insulator or projected tip.” This type of spark plug has an extended ceramic insulator tip that protrudes further than regular insulator tips in most spark plugs.

Spark plugs with projected tips can focus the spark further, thereby enabling the plug to swiftly ignite the air-fuel mixture and deliver an efficient performance.

What happens if you run a hotter spark plug?

If you run a hotter spark plug in your vehicle’s internal combustion engine, there’s a tendency to experience overheating. If this is the case, the electrodes in the spark plug may wear out faster. You may also experience pre-ignition issues.

Therefore, it is crucial to hold onto the spark plug specifications recommended by your vehicle’s manufacturer to keep it running efficiently.

Final Words

Undoubtedly, NGK manufactures some of the best spark plugs in the automotive industry. Nevertheless, their various spark plug models are designed for use in different applications.

 This review differentiates between BPR5ES Vs. BPR6ES spark plugs, including their pros and cons. Therefore, while NGK stands as a reputable brand generally, you need the best model for optimal engine performance.

 So this article has outlined the differences between them and their pros and cons to help you make a better buying decision.

Osuagwu Solomon

Osuagwu Solomon is a certified mechanic with over a decade of experience in the mechanic garage, and he has over five years of experience in the writing industry. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyer’s guides, and car and tools comparisons.

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