Prices verified Jun 22 · Always confirm at the retailer before buying.
The K&N KN-204 wins for most riders — universal fitment and a 3,266‑review track record give it the edge over the Polaris‑specific KN‑198. The KN‑198 is the right choice only for Polaris owners.
The Verdict
Best for most people
K&N Motorcycle Oil Filter KN-204
Universal fitment, higher review count (3,266 vs 1,261), and identical K&N quality at nearly the same price.
Pick the K&N Polaris Oil Filter KN-198 instead if
- You ride a Polaris ATV or motorcycle — the KN-198 is a guaranteed direct fit with no cross-referencing.
- You’re on a tight budget and want to save less than a dollar — the KN-198 is marginally cheaper.
K&N Motorcycle Oil Filter KN-204 vs K&N Polaris Oil Filter KN-198, side by side
K&N Motorcycle Oil Filter KN-204
Pros:
- 4.8-star rating from 3,266 verified buyers
- Universal fitment works with many motorcycle models
- Trusted K&N brand with decades of filtration expertise
Cons (honest weight):
- Costs about a dollar more than the Polaris-specific counterpart
- Not vehicle-specific, requires cross-referencing
K&N Polaris Oil Filter KN-198
Pros:
- Direct fit for Polaris ATV and motorcycle models — no guesswork
- 4.8-star rating from 1,261 verified buyers
- Budget-friendly at under $18
Cons (honest weight):
- Only compatible with Polaris vehicles
- Fewer reviews than the KN-204 — less long-term validation
Where each one wins
8 dimensions scored head-to-head. K&N Motorcycle takes 2; K&N Polaris takes 1.
| Dimension | K&N Motorcycle Oil Filter KN-204 | K&N Polaris Oil Filter KN-198 | Winner |
|---|---|---|---|
| PriceThe KN‑198 costs a dollar less. | $18.99 | $17.97 | K&N Polaris |
| RatingBoth receive exceptional customer satisfaction. | 4.8 stars | 4.8 stars | Tie |
| Review CountThe KN‑204 has over 2.5× more feedback. | 3,266 reviews | 1,261 reviews | K&N Motorcycle |
| Fitment VersatilityThe KN‑204 fits a broader range of bikes. | Universal (fits many motorcycles) | Polaris‑specific | K&N Motorcycle |
| Brand TrustBoth come from a leader in high‑flow filtration. | K&N — decades of filtration expertise | K&N — same trusted manufacturer | Tie |
| Filtration EfficiencyBoth use K&N’s proven high‑flow technology. | High‑flow media | High‑flow media | Tie |
| Build QualityBoth feature the same durable design with a grip‑friendly finish. | Sturdy, easy‑grip coating | Sturdy, easy‑grip coating | Tie |
| Ease of InstallationBoth include a built‑in nut for easy removal. | Welded nut for wrench attachment | Welded nut for wrench attachment | Tie |
| Overall | 2 wins | 1 win | K&N Motorcycle |
Price: Too Close to Matter? — KN‑198 Takes It
The KN‑198 is cheaper. That’s negligible for most buyers. For the price of a coffee, the universal KN‑204 opens up many more motorcycles.
If you own a Polaris, that dollar is worth it. The KN‑198’s direct fit saves you research time and potential ordering mistakes.
Rating: Dead Even — Tie
Both score 4.8 stars from thousands of rides. Customer sentiment is overwhelmingly positive. No clear winner here.
The high ratings confirm consistent quality. Whether you choose the universal or specific model, you’re getting a highly rated filter.
Review Count: KN‑204 Dominates
The KN‑204 has 3,266 reviews, over 2.5 times the KN‑198’s 1,261. More data means more confidence in long‑term reliability. Verified buyers praise improved oil flow and engine protection.
That massive feedback pool gives the KN‑204 an edge. It’s been tested across more motorcycles and riding conditions.
Fitment Versatility: KN‑204 Wins
The KN‑204 fits a wide range of motorcycles — Honda, Yamaha, Suzuki, and more. The KN‑198 is locked to Polaris models. Unless you ride a Polaris, the KN‑204 is the only option that makes sense.
Universal fitment means you can keep one filter on hand. Great for multi‑bike households or if you ride multiple brands.
Brand Trust: Both Backed by K&N — Tie
K&N has built a reputation for high‑quality filtration. Both filters inherit that legacy. Owners consistently mention brand trust as a reason for their purchase.
Amazon buyers repeatedly say “K&N is the only brand I trust.” That sentiment applies equally to both models.
Filtration Efficiency: Identical — Tie
Both use K&N’s high‑flow media. Verified purchasers report better oil flow than stock filters. Engine longevity and performance seem improved.
No measurable difference in filtration quality. The key spec — the filter media — is the same.
Build Quality: Solid on Both Sides — Tie
The canisters are sturdy with a textured coating for grip. Many reviewers note the easy spin‑on installation. The welded nut is a game‑changer for removal, though some caution against overtightening.
Durability appears identical. Both are built to handle the heat and vibration of a motorcycle engine.
Ease of Installation: Wrench‑Ready — Tie
The built‑in nut makes removal a non‑issue. Buyers love that they can use a standard wrench instead of a specialized filter tool. The only caution: hand‑tighten to spec — don’t crank on the nut.
No adapter needed for either filter. They spin on smoothly and seal correctly out of the box.
Which should you buy?
| Your situation | Pick | Why |
|---|---|---|
| Daily commuter on a Honda or Yamaha | K&N Motorcycle Oil Filter KN-204 | Universal fitment covers most commuter bikes. |
| Polaris ATV owner | K&N Polaris Oil Filter KN-198 | Guaranteed direct fit — no guesswork. |
| Road‑trip rider covering thousands of miles | K&N Motorcycle Oil Filter KN-204 | Proven performance over long distances. |
| Budget‑conscious buyer | K&N Polaris Oil Filter KN-198 | Saves a dollar, still K&N quality. |
| First‑time DIY mechanic | K&N Motorcycle Oil Filter KN-204 | Easier to find specs and install guides for the popular universal model. |
| Performance tuner with a modified engine | K&N Motorcycle Oil Filter KN-204 | High‑flow media supports tuned engines better. |
Universal fitment covers most commuter bikes.
Guaranteed direct fit — no guesswork.
Proven performance over long distances.
Saves a dollar, still K&N quality.
Easier to find specs and install guides for the popular universal model.
High‑flow media supports tuned engines better.
What if neither is right?
EZ-106 EZ Oil Drain Valve
$24.85
Make every oil change faster with a quick‑drain valve, no tools needed.
EZ Oil Drain Valve L-Hose End
$9.76
Attach a hose to avoid messes during oil drains — simple add‑on.
Frequently Asked Questions
Which oil filter is better, the K&N KN-204 or KN-198?
The KN-204 is better for most riders because it fits a wide range of motorcycles and has three times more verified reviews. The KN-198 is the better choice only if you own a Polaris vehicle, as it’s designed for a perfect fit.
Do both filters fit my motorcycle?
The KN-204 fits many popular motorcycle brands including Honda, Yamaha, and Suzuki. Always check the manufacturer’s cross‑reference guide. The KN-198 fits Polaris ATVs and motorcycles only — it will not work on other brands.
Is the KN-204 worth the extra $1 over the KN-198?
Yes, for most riders the dollar more is well worth it. The KN‑204’s universal fitment means you can use it on multiple bikes, and the larger review pool gives greater confidence in its long‑term reliability.
How often should I change my oil filter?
Most motorcycle manufacturers recommend changing the oil filter with every oil change, typically every 3,000 to 6,000 miles. Using a high‑quality filter like the K&N helps protect your engine between intervals.
Can I use the KN-198 on a non‑Polaris bike?
No. The KN-198 is engineered specifically for Polaris applications. Using it on a different brand may result in poor fitment, leaks, or engine damage. Stick with the KN‑204 or check K&N’s fitment guide for your model.
We analyzed 4,527 verified Amazon reviews across these two K&N oil filters, confirming high satisfaction in filtration and build quality. Additional insight from brand reputation and community feedback informed this comparison.
Who wrote this and where's the data from?
Mubboo Editorial Team — independent US‑market consumer research. This comparison is based on verified buyer feedback and product specifications.