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Spare parts reviews ➔ All comparisons ➔ K&N ➔ Castrol

Oil filter K&N or Castrol

Reviews
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K&N
Castrol
K&N › Oil filter
Mizar97
Rating 4.0

Personally I like K&N filters, they come with a nut welded to them so you can use a normal wrench instead of a filter wrench. Gotta be careful not to over tighten them though

Pros: nut welded to them
Cons: careful not over tighten
Vehicle: Subaru
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K&N › Oil filter
Motor-Professor6268
Rating 4.0

I have a kn 1 on my truck and winter is about every 1k miles I empty it. Its the 6oz canister and usually about half full. From may till like October I dont even have to look in it because it doesnt get more than an oz of oil build up in it. But man winter time with the condensation sucks.

Pros: little oil build up
Cons: condensation sucks
Mileage: 1000 km
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Castrol › Oil filter
apex_lokai
  • Warning light:
Rating 4.0

I use Pennzoil 0W-30 Euro Platinum, and a Castrol CAS3593 filter every time, and change my oil every 6000kms which is about 3728 miles. I have heard good things about the efficiency of the Castrol filters.

Pros: good efficiency
Mileage: 6000 km
Part number: CAS3593
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K&N › Oil filter
BenDoverandillshowyu
  • Leaks:
Rating 5.0

That won’t happen if you were using a K&N oil filter. All these cheap brand filters are not sturdy and will collapse when you’re trying to take them off when stuck… either The Black K&N select filter or the white Premium filter will avoid this problem from happening…

Pros: sturdy, avoids collapsing
Cons: cheap filters collapse
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K&N › Oil filter
ElMurkel
  • Warning light:
Rating 1.0

Not sure about mobil1 filters, but stay away from K&N oil filters. I've just used one for an oil flush after extensive maintenance work, and after just 100 km it had collapsed.

Cons: collapsed after 100km
Mileage: 100 km
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Which oil filter to choose — K&N or Castrol?

If choosing oil filter across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.

We compare oil filter across these categories:

Comparison of oil filter K&N and Castrol
  1. PR Score.
  2. Overall ranking.
  3. Vote balance.
  4. Average rating.
  5. Number of reviews.
  6. Feature ratings.
  7. Car owners’ choice.

Which oil filter are better — Castrol or K&N?

In March 2026 on PartReview, oil filter K&N were overall better than Castrol.

  1. K&N received a PR Score of 70 out of 100, and Castrol scored 100 points.
  2. K&N ranked 9 in the overall ranking, and Castrol ranked 13.
  3. The average rating is higher for Castrol (4.8) than for K&N (3.6).
  4. Oil filter Castrol have better feature ratings than K&N:
    • Warning light - owners believe, that this property for Castrol is better than K&N.
    • Leaks - drivers claim, that this property for K&N is outperforms Castrol.
    • Smell/smoke - reviews suggest, that this property for K&N is preferred to Castrol.

Which oil filter are more popular — K&N or Castrol?

In March 2026 on PartReview, oil filter K&N were overall more popular than Castrol.

By vote balance, oil filter K&N surpassed Castrol:

  • For K&N, the ratio of positive (214) to negative (91) votes is 123 votes.
  • For Castrol, the ratio of positive (42) to negative (0) votes is 42 votes.

By number of reviews, oil filter K&N surpassed Castrol:

  • For oil filter K&N there are 99 reviews: 66 positive, 8 neutral, 25 negative.
  • For oil filter Castrol there are 14 reviews: 14 positive, 0 neutral, 0 negative.

Which oil filter do car owners prefer — K&N or Castrol?

In March 2026, according to PartReview, oil filter K&N and Castrol have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.

Other comparisons of oil filter

If this comparison didn’t fully answer your question, there are many others on PartReview.

For example, comparisons of oil filter K&N with: Fram, Mann, Wix, Mobil, Bosch, OEM Toyota, Motorcraft, OEM Volkswagen, OEM Honda, AMSOIL.

Also available: comparisons of oil filter Castrol with: Fram, Mann, Wix, Mobil, Bosch, OEM Toyota, Motorcraft, OEM Volkswagen, OEM Honda, AMSOIL.

You can also see who is better among other oil filter manufacturers: Fram or Mann, Fram or Wix, Fram or Mobil, Fram or K&N, Mann or Wix.

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