K&N Motorcycle Oil Filter KN-138 Review
By Editorial Team · Last Updated: June 6, 2026
The K&N Motorcycle Oil Filter KN-138 is made for select Suzuki motorcycles. It is designed to help remove harmful contaminants from engine oil while supporting strong oil flow. The filter uses synthetic-blend filtration media, a heavy-duty canister, and a Wrench-Off nut for easier removal during oil changes.
Quick Verdict
The K&N KN-138 is a strong pick if your Suzuki motorcycle uses this filter size and you want easier removal during routine maintenance. Its synthetic-blend media, heavy-duty shell, and oil-flow-focused design make it a practical choice for riders who want a dependable replacement oil filter.
Key Specs
| Specification | Detail |
|---|---|
| Brand | K&N |
| Model | KN-138 |
| Product Type | Motorcycle oil filter |
| ASIN | B000E2CVDI |
| Filter Media | Synthetic-blend filtration media |
| Compatibility Mentioned | Select Suzuki motorcycles. Check your owner’s manual or Amazon fitment tool before buying. |
| Oil Type Support | Designed for use with synthetic, conventional, and blended motor oils. |
| Removal Feature | Wrench-Off nut for easier removal |
Products Worth Considering
HIGH FLOW RATES: Designed to provide exceptional flow rates and a consistent flow of oil to your engine
HIGH FLOW RATES: Designed to provide exceptional flow rates and a consistent flow of oil to your engine
What Is the K&N Motorcycle Oil Filter KN-138?
The K&N KN-138 is a replacement motorcycle oil filter. It is designed to filter engine oil and help protect internal engine parts from dirt, debris, and other contaminants.
This filter is aimed at select Suzuki motorcycle applications. Fitment matters, so you should confirm the exact model, year, and engine match before ordering.
Who Is It For?
The K&N KN-138 is for riders who do regular motorcycle oil changes and want a filter that supports strong oil flow. It also suits riders who prefer a filter with easier Wrench-Off removal.
It may be a good fit if your Suzuki motorcycle requires this filter model and you use synthetic, conventional, or blended motor oil.
Products Worth Considering
HIGH FLOW RATES: Designed to provide exceptional flow rates and a consistent flow of oil to your engine
HIGH FLOW RATES: Designed to provide exceptional flow rates and a consistent flow of oil to your engine
HIGH FLOW RATES: Designed to provide exceptional flow rates and a consistent flow of oil to your engine
Who Should Skip It?
Skip this filter if your motorcycle does not list KN-138 as a compatible oil filter. You should also avoid buying it based on looks alone, because oil filter thread size, seal size, and fitment must match your motorcycle.
If you are unsure, check your motorcycle manual, current filter number, or Amazon fitment details before buying.
Products Worth Considering
TIPS: 1. BENT head design for easier use in some tight space; 2. OIL on product for rust protection (not used)
Universal Oil Filter Removal Tool: Fits filters from 2-3/8 to 3-3/4 inches (60 to 95 millimeters) in diameter. You can drive it with a 3/8" square driver tool or a 5/8" wrench/socket
2 PIECE UNIVERSAL OIL FILTER WRENCH SET - Includes a 12" adjustable oil filter plier and a 3-jaw oil filter removal wrench. Designed to handle most common sizes of oil filters, this complete set is ideal for oil changes in cars, motorcycles, trucks, SUVs, and farm equipment
Key Features of the K&N Motorcycle Oil Filter KN-138
The K&N Motorcycle Oil Filter KN-138 focuses on filtration, oil flow, and easy service. Its synthetic-blend media is designed to capture harmful particles while still allowing oil to move through the filter properly.
The heavy-duty canister helps the filter handle tough riding conditions. This matters because motorcycle oil filters face vibration, heat, pressure, and road exposure during normal use.
The Wrench-Off design is another useful feature. It can make removal easier during oil changes, especially when the old filter is tight or hard to grip.
- Synthetic-blend filtration media helps trap contaminants.
- Heavy-duty canister supports better durability.
- Wrench-Off nut can make filter removal easier.
- Designed to work with synthetic, conventional, and blended oils.
- Made for select Suzuki motorcycle applications.
Real-World Use
In normal use, this filter is best for routine oil changes. It can help maintain clean oil flow, which supports smoother engine operation and long-term engine care.
The main benefit for many riders is convenience. The Wrench-Off nut can save time when removing the filter. This is helpful if your motorcycle has limited working space around the filter area.
For best results, always follow the oil change interval in your motorcycle owner’s manual. Filter replacement timing can vary by motorcycle, oil type, riding style, and riding conditions.
Durability and Construction
The K&N KN-138 uses a heavy-duty canister that is made to resist damage during normal motorcycle use. This helps the filter stay secure and functional through heat, vibration, and pressure changes.
The article details mention testing for capacity and burst strength. That is important because an oil filter must handle oil pressure while keeping the engine protected.
The KN-138 is not just about filtration. It is also built for serviceability, which is helpful for riders who perform their own maintenance.
Why Compatibility Matters for Motor Oils
Oil filter compatibility is important because the wrong filter can cause leaks, poor fitment, or weak filtration. The KN-138 should only be used on motorcycles that match this filter model.
This filter is designed to work with different motor oil types, including synthetic, conventional, and blended oils. Still, the oil itself must match your motorcycle’s required viscosity and service rating.
- Correct fitment helps prevent oil leaks.
- Correct oil viscosity supports proper engine lubrication.
- Correct filter selection helps protect engine parts from harmful debris.
Before buying, check your motorcycle manual and confirm the filter number. Do not rely only on brand or motorcycle family name.
Installation Tips for the KN-138
Installation is straightforward if the KN-138 is the correct filter for your motorcycle. Start by removing the old filter and cleaning the sealing surface.
Before installing the new filter, apply a light coat of clean engine oil to the rubber gasket. This helps the gasket seat properly and makes removal easier during the next oil change.
Thread the filter on carefully by hand first. Do not cross-thread it. Tighten it according to the instructions in your motorcycle manual or the filter packaging.
After adding oil, start the motorcycle and check for leaks around the filter. Then shut the engine off, wait a short time, and recheck the oil level.
Pros and Cons
Pros
- Synthetic-blend media helps filter harmful contaminants from engine oil
- Wrench-Off nut can make removal easier during oil changes
- Heavy-duty canister supports durability in motorcycle use
- Works with synthetic, conventional, and blended motor oils
Cons
- Only fits select motorcycle applications
- You must confirm fitment before buying
- Warranty and compatibility details should be checked on the current product page or packaging
Is It Worth the Price?
The K&N KN-138 is worth considering if it matches your motorcycle and you want a filter that focuses on oil flow, filtration, and easier removal. The Wrench-Off design gives it a practical edge for riders who handle their own maintenance.
Value depends on fitment and your maintenance needs. If you only need a basic replacement filter, you may compare it with OEM and other trusted filter brands. If easier removal matters to you, the KN-138 may feel more convenient.
Alternatives to Consider
You can also compare the K&N KN-138 with other motorcycle oil filter options before buying. Good alternatives may include OEM Suzuki oil filters, Hiflofiltro motorcycle oil filters, and Fram motorcycle oil filters.
Use these names only as comparison points. The correct choice depends on your exact motorcycle model, engine, and required filter number.
Frequently Asked Questions
How Often Should I Replace the K&N Motorcycle Oil Filter KN-138?
Replace it based on your motorcycle owner’s manual. Many riders replace the oil filter at each oil change, but the correct interval depends on your motorcycle, oil type, and riding conditions.
Is the K&N KN-138 Environmentally Friendly?
The supplied article details do not confirm a specific environmental claim for the KN-138. Dispose of used oil and used oil filters through an approved recycling or disposal location.
Can I Use the KN-138 on Other Motorcycle Brands?
Use the KN-138 only if it is listed as compatible with your motorcycle. The article details focus on select Suzuki motorcycles, so check fitment before using it on any other brand.
What Is the Oil Capacity for the KN-138 Filter?
The supplied article details do not provide a separate oil capacity for the filter. Use the oil capacity listed in your motorcycle owner’s manual, and check the oil level after installation.
Does the KN-138 Work With Synthetic Oil?
Yes. The article details state that the KN-138 is designed to work with synthetic, conventional, and blended motor oils. Always use the oil type and viscosity recommended for your motorcycle.
Where Can I Buy the K&N Motorcycle Oil Filter KN-138?
You can buy the K&N Motorcycle Oil Filter KN-138 through Amazon and other motorcycle parts retailers. Before ordering, confirm that ASIN B000E2CVDI and model KN-138 match your motorcycle’s required filter.
Final Verdict
The K&N Motorcycle Oil Filter KN-138 is a practical choice for select Suzuki motorcycles that require this filter model. It offers synthetic-blend filtration media, a heavy-duty canister, and easier Wrench-Off removal.
The biggest thing to check is fitment. If the KN-138 matches your motorcycle, it can be a strong option for routine oil changes and engine oil filtration.
