Which Is Better for Your Engine: an NGK BPR4ES or BPR5ES Spark Plug?

Both BPR4ES and BPR5ES are manufactured by NGK, so what gives? The terminal design of the spark plugs in the NGK BPR5ES series is different from that of the NGK BPR4ES series. Dimensional, functional, lasting, and financial distinctions are just the tip of the iceberg.

Because of its reliability and durability, NGK spark plugs are widely used in vehicles across the globe. Although there are many different types of NGK spark plugs available, this article will focus on the BPR4ES and BPR5ES models. The details are still being worked out, so stay tuned.


A Quick Comparison of the NGK BPR4ES and BPR5ES

Forming a terminalHaving a strong and unmovable endingFeatures a nut-shaped connection
Size3.43 x 1.69 x 0.94 inches3.3 x 1 x 0.8 inches
FeaturesFeatures less functionalityHas more features
LongevityNot as durable as the NGK BPR5ES.Lasts longer
Best ForKawasaki, Hustler, and Spartan engines work the bestIt fits Kawasaki, Husqvarna, and Honda engines

Comparing NGK BPR4ES and NGK BPR5ES, You’ll Find Many Parallels

However, there are some parallels between the NGK BPR4ES and the NGK BPR5ES spark plugs, despite their many differences. The following table will illustrate these parallels.

SubstanceNickel, MetalNickel, Metal
Core substanceCopperCopper
Features a resealable triple gasket designYesYes
Featuring a plating of three different metalsYesYes

Listed below is a comprehensive comparison of BPR4ES and BPR5ES.

Indicator of a Terminal Condition

Those wondering, “The difference between NGK BPR4ES & BPR5ES?” should first familiarize themselves with the two terminal types used by each. The NGK BPR4ES has a rigid and permanent connection at its end. The link is unbreakable and eternal.

Conversely, NGK BPR5ES has a nut-style termination at its end. In contrast to the permanently connected spark plug, this one can be disconnected. The NGK BPR5ES spark plug is a direct replacement and may be installed with a simple set of screws.


The NGK BPR4ES spark plug has measurements of 3.43 by 1.69 by 0.94 inches. It weighs a total of 4.2 ounces. In contrast, the NGK BPR5ES spark plug is 3.3 by 0.8 by 1.0 inches in size. To be precise, it weighs 0.32 ounces. Thus, when choosing between the NGK BPR4ES and BPR5ES spark plugs, opt for the BPR5ES if portability is a must.


Trivalent metal plating on the NGK BPR4ES spark plug makes it resistant to corrosion and seizing. And the flashover is avoided thanks to the corrugated ribs. The insulator of this spark plug is made from pure alumina silicate ceramic, which allows for increased resistance to heat and increased durability.

This spark plug features a solid copper core material for increased heat range, greater heat conductivity, and superior heat dissipation. Finally, the NGK BPR4ES spark plug has a triple seal to keep gas from leaking. But the NGK BPR5ES’s cold-rolled threads shield the cylinder head from harm.

Features such as the NGK BPR4ES’s triple gasket sealing nearly eliminate gas leakages beyond the shell. The NGK BPR5ES is identical to the NGK BPR4ES in all other respects, including having a copper core and a plating of trivalent metals. There is little doubt, however, that the NGK BPR4ES spark plug outshines the NGK BPR5ES in terms of functionality.


The NGK BPR5ES spark plug is the most long-lasting option. Talks about long- and power, the NGK BPR5ES spark plug is unrivaled. When the tractor is cold, the NGK BPR4ES produces a hotter spark to help it start.

Contrarily to the NGK BPR4ES spark plug, the NGK BPR5ES spark plug does not produce a spark of quite as high a temperature. In reference to this topic, one forum member wrote,

There is no other discernible differences between these 2 plugs, except that the ‘5’ is a cooler plug.

The NGK BPR5ES spark plug is cooler to the touch than the hottest BPR4ES model.

When comparing the NGK BPR5ES to the NGK BPR4ES, we find that the former has a longer lifespan.


When comparing NGK BPR4ES and NGK BPR5ES, the former has a more expensive price tag.

The NGK BPR4ES spark plug typically costs between $3 and $10. However, you may expect to pay anything from $2 to $6 for an NGK BPR5ES spark plug.

The NGK BPR5ES spark plug is less expensive than the NGK BPR4ES, so choose that one if you need to decide between the two.


What is the equivalent spark plug to the BPR4ES?

The NGK BPR4ES spark plug can be replaced with any of the many similar spark plugs. Autolite 4265 and Champion RN14YC spark plugs are the most popular. Additionally, there are a plethora of other spark plugs available, such as the AC Delco R44XLS, Bosch W10DC, Champion 405, Honda 98079-54817, Nissan F2000, Nissan V1414, Napa X761, Motorcraft AGR82, General Motors 5613878, and many more.

Where do NGK BPR4ES and BPR6ES diverge?

In comparison to the NGK BPR4ES, the NGK BPR6ES is two heat ranges colder, and this is the fundamental distinction between the two spark plugs. The pricing is another key distinction between these two spark plugs. When comparing the NGK BPR6ES to the NGK BPR4ES, the former comes out on top in terms of price.

Where does the letter “R” come from on an NGK spark plug?

When you see the letter “R” on an NGK spark plug, you know it is a resistor model. By reducing the amount of radio frequency interference, such spark plugs prevent radio static and ignition misfires. With the resistor incorporated right into the spark plug, cranking the engine is much quieter.

So, Which One Should You Choose?

We are now at the point where we must choose between the NGK BPR4ES and the NGK BPR5ES spark plugs. However, the NGK BPR5ES spark plug is what we recommend, however your decision is ultimately up to you. This is due to the fact that the NGK BPR5ES spark plug outperforms the NGK BPR4ES spark plug in every aspects, including cost, weight, and lifespan.

The NGK BPR4ES spark plug, on the other hand, more options than the NGK BPR5ES spark plug and is the better choice if you’re looking for a lot of bang for your buck.

But the ultimate decision is up to you. When deciding between the NGK BPR4ES and the BPR5ES, it’s important to think about the factors we’ve outlined here.