Royal purple oil filter vs k&n oil filter: What’s the Differences?

Royal Purple Oil Filter and K&N filters- both are very popular oil filter brands in the market. Hence, a lot of users will prefer the K&N oil filter because of its easy-to-remove wrench-off design. However, the need for a high-performance oil filter goes beyond the easy-to-remove feature that the K&N offers.

Now, as Royal Purple Oil filter and K&N oil filters are manufactured by the same producer, they have a lot of things in common. Nevertheless, every vehicle owner must look beyond the manufacturers of these oil filters and focus more on the construction and filtering quality. This will form a solid foundation to make better market decisions.

To ensure that you make the perfect decision in your choice for the best oil filter for your engine, we have created this article to compare the Royal Purple oil filter vs K&N Oil filter.

In a hurry!

K&N Oil Filter can be a better choice, especially if you need an oil filter that will handle intense pressure, and extreme driving conditions, with a high demand for excellence. K&N Oil filter is more durable than Royal Purple and will achieve a high flow rate and advanced filtration.

Royal purple oil filter vs k&n: What Are They?

about Royal purple oil filter

Royal Purple Oil filters are one of the superior oil filters with heavy-duty construction and outstanding flow. The filter also includes synthetic media that is made of 100% micro-glass. This ensures an optimal efficiency that captures over 99% of particles at a 25-micron rating and 80% of particles at a 10-micron rating.

The technology of the Royal Purple Oil Filter includes a steel backplate, filter element, case (shell), metal end caps, center tube, bypass valve, anti-drain back valve, and gasket. Hence, its refined filter media are made of cellulose filtration filters that improve filtration efficiency and lubrication.

The inclusion of a strong-walled steel case sustains durability and higher burst strength. Royal Purple Oil Filter’s anti-drain back is made of high-quality silicone, preventing the possibility of a dry start. Its heavy-duty gaskets prevent spillage and oil leakage as well.

Who makes Royal purple oil filters?

Champs labs make Royal Purple Filters. Champ labs oversee the production of a lot of OEM products. Royal Purple Oil Filter is not an exception here. 

It should not shock you that Royal Purple doesn’t make its filters. However, this doesn’t affect the quality of the products, because Champ labs produce them to match the specifications of Royal Purple. 

There are speculations that Royal Purple oil filters are made by Calumet Specialty Products Partners. Calumet Lubricants bought the Royal Purple company, but there is no verifiable data to prove that they manage the production of the Royal Purple Oil filters.

Where is the Royal purple oil filter manufactured?

Royal Purple Oil filter is made in the USA. Champ Labs has its production units in Albion, Illinois, and South Carolina. This must be where the manufacturing of the Royal Purple oil filters takes place.

about K&N Oil Filters

Just like every other oil filter, the K&N oil filter is designed to capture oil deposits and contaminants. However, there are advancements in its design. K&N oil filters boost durability, high flow, and outstanding filtration.

K&N Oil filters are classified into different categories. From ultra-premium performance filters, premium oil filters, high mileage, down to heavy-duty oil filters for diesel engines- there are numerous designs for different vehicles.

However, K&N HP filters are well-known for certain features;

Where are K&N Oil Filters manufactured?

K&N Oil filters are made in the USA.  K&N Oil filters are made in Champ labs’ headquarters in Albion, Illinois. However, some K&N oil filters are also manufactured in K&N’s headquarters in Riverside, California.

differences between Royal purple oil filter and k&n

FeaturesRoyal purple oil filtersK&N Filters
Bypass ValveStamp SteelCoil Spring
ID: Internal Diameter
OD: Outer Diameter
Metal (six holes)
ID: 1 1/8
OD: 2 ¼ 
Metal (six holes)
ID: 1 inch
OD: 2 ¼ Inches
Efficiency rating99% Efficiency95% Efficiency
Mileage12,000 – 15,000 miles10,000
Filter MaterialSyntheticImpregnated Cellulose
Filter Material (Length)30 ¾53.5
Surface Area53.8 sq. inches93.6 sq. inches

Bypass Valve

The Bypass Valve comes in handy when the filter is clogged, and the oil filter experiences degradation of flow rate. Hence, the bypass valve acts as a bypass channel for the oil to flow into the engine.

Royal Purple’s stamp steel is inferior compared to the K&N filter’s coil spring.

Winner: K&N Oil Filter


Royal Purple achieves a higher mileage than K&N. Royal Purple oil filters cover 12,000 – 15,000 miles whereas the K & N Oil filter covers 10,000 miles.

Winner: Royal Purple Oil Filter

Safe and Easy Installation

One of the great features of K&N oil filters is the inclusion of their wrench-on design. The tiny nut space also serves as a safety component for riders to run a wire into it to prevent accidents during blowouts.

This is a cool feature for motorcycle racers. However, Royal Purple doesn’t have these features.

Winner: K&N Oil Filter

Efficiency and Micron Rating

Royal Purple captures 98.7% deposits at a 20-micron rating. This is higher compared to K&N Oil filters that have an efficiency rating of 85% at a 20-micron rating.

Even as the charts fluctuate, at 25 and 10 microns, K&N records a 95% and 75% efficiency rating respectively.

However, Royal Purple captures 99% at a 25-micron rating and 80% at 20 microns. This is a pretty impressive count.

Winner: Royal Purple Oil Filter

Overall Design

Considering the filter Material, filter Material (Length), Surface Area, and quality of casing, the K&N oil filter comes with a superior design and outstanding quality. This reflects in its durability and overall performance.

Winner: K&N Oil Filters

Royal purple oil filter vs k&n (key similarities)

Aside from sharing the same manufacturer, there are a lot of similarities that Royal Purple Oil and K&N Oil filter have in common.

End Caps

The End Caps act as the sealing point for the filter media in oil filters. K&N and Royal Purple employee the use of Metal materials in the construction of their end caps. This provides superior quality to filters with end caps made of engineered fiber, or plastic.

While there are slight differences in the inner diameter of both filters, they maintain the same measurement in the outer diameter and the number of holes therein.

Anti-drain back Valve

One of the major functions of an anti-drain back valve is to prevent dry starts by retaining oil in the filter after the engine stopped running. It does this by preventing oil from running out of the filter. 

This oil retention is a cool feature, and the material used is also worthy of consideration. Some anti-drain back valves are made of nitrile material and some silicone. 

Royal Purple and K&N oil filters are made of silicone.

Compatible with all types of oils

K&N and Royal oil filter- both are compatible with all types of oil. You can use them with your conventional, synthetic, and synthetic blend oils.

People also ask

How many miles is a Royal Purple Oil Filter good for?

A Royal Purple Oil filter is good for 12,000 – 15,000 miles. You can use them as long as these recommended miles under normal driving conditions, before considering a change. However, you should consider dabbing the gasket with some oil after each oil change. This will prevent leaks and spillage.

How many miles are K&N Oil filters good for?

K&N Oil filters are good for 10,000 miles. They can withstand pressure and accumulate as many deposits as they can during this period even in between oil change intervals. 

However, the driving conditions also matter. A K&N Oil filter used for dirt races or intense driving conditions wouldn’t last more than 7,500 miles.

Does a K&N Oil Filter add Horsepower?

Yes, K&N Oil filter adds horsepower. The filtration and collection of deposits allow the proper lubrication and improved performance of the engine. 

This achieves an increase in power and driving experience. This is because the horsepower, acceleration, and torque of the engine were improved.

Also Read:

Royal Purple Vs K&N: key Takeaways

  • Royal Purple Oil Filters can ensure more efficiency than K&N Oil filters. Comparing both filters at different micron ratings proves Royal Purple Oil as the winner.
  • K&N Oil Filters is a better option for motorcycle racers. The wrench-on design and the hole to run a wire through add a safety feature that keeps it firmly secured.
  • K&N Oil filter is more durable, high performing, and built to a heavy-duty style. It offers users a wide range of options to choose from, depending on their vehicle needs.


Who Worked on This?



I'm the guy responsible for ensuring that every blog post we publish is helpful for our reader.

Mahir Ahmed


I'm the guy responsible for ensuring honest, informative, accurate and helpful guide to the reader.

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