Engine radiator Koyo or OEM BMW

PartReview Score

Rank #1 in ranking

147

4.4

Leaks

3.6

Overheating

4.5

Sweet smell

5.0

Owners' choice:

Honda S2000

PR Score

Ranking

Votes

Reviews

Average rating

Properties

Car

PartReview Score

Rank #9 in ranking

3.0

Leaks

2.1

Overheating

3.1

Sweet smell

5.0

No data

Reviews

All

Koyo

OEM BMW

Koyo › Engine radiator

deathbysnusnu7 20 Jan 2026, 22:17

Overheating:

Rating 5.0

Put a koyo rad in it and it’s been good to go.

Pros: good to go

Koyo › Engine radiator

Sir_J15 20 Jan 2026, 12:58

Overheating:

Rating 5.0

If you go aluminum Koyo is the way to go.

Pros: good aluminum radiator

Koyo › Engine radiator

chevy42083 8 Jan 2026, 22:16

Overheating:

Rating 5.0

I went with Koyo. CARid was the best price at the time. Been 7 years and no issues.

Pros: no issues for years

Koyo › Engine radiator

PinkTrunks88 17 Dec 2025, 00:13

Leaks:

Rating 5.0

Radiators aren\u2019t supposed to leak. I have the same Koyo radiator in my NA Z, just put it in this past summer. I def do not have that leak.

Cons: radiator shouldn't leak

Vehicle: Nissan

Koyo › Engine radiator

akep 15 Dec 2025, 11:40

Rating 5.0

Personally I’d be buying a koyo in full aluminum.

Pros: full aluminum

Koyo › Engine radiator

chefsoda_redux 12 Dec 2025, 04:08

Overheating:

Rating 5.0

I went with a Koyo radiator, which is considerably better built than the factory piece, cost less than $300 with new hoses, and took maybe 2 hours, start to finish. Of course, I replaced the coolant at the same time.

Pros: better built than factory

Vehicle: Honda S2000

Koyo › Engine radiator

trackaddict8 8 Dec 2025, 22:51

Overheating:

Rating 5.0

just tested my new koyo hyper V at the track and that thing kept it rock solid cold, 180-203f the entire day but it was like 68 degrees out lol.

Pros: kept it rock solid cold

OEM BMW › Engine radiator

Remarkable_Leave_294 20 Nov 2025, 11:15

Leaks:

Rating 3.0

It happened to me once at a night time. I just pulled over, stopped the engine and started again after several minutes and everything was OK.

Edit: After reading other's comments, I realized that mine also related to coolant system. Some time after this incident I replaced radiator because of a coolant leak. May be this warning is related to that.

Pros: Everything was OK

Cons: coolant leak

OEM BMW › Engine radiator

ronbiomed 10 Jan 2026, 15:05

Overheating:
Leaks:

Rating 1.0

My first non warranty repair on my B58 540 was a $3k radiator replacement. That was at about 60k miles.

Cons: expensive radiator replacement

Vehicle: BMW

Mileage: 96560 km

OEM BMW › Engine radiator

SupMojo000 29 Jul 2025, 23:46

Overheating:

Rating 1.0

You need to replace that. Bmws run hot. Only fix

Vehicle: BMW

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Which engine radiator to choose — Koyo or OEM BMW?

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

We compare engine radiator across these categories:

Comparison of engine radiator Koyo and OEM BMW

PR Score.
Overall ranking.
Vote balance.
Average rating.
Number of reviews.
Feature ratings.
Car owners’ choice.

Which engine radiator are better — OEM BMW or Koyo?

In March 2026 on PartReview, engine radiator Koyo were overall better than OEM BMW.

Koyo received a PR Score of 92 out of 100, and OEM BMW scored 55 points.
Koyo ranked 1 in the overall ranking, and OEM BMW ranked 9.
The average rating is higher for Koyo (4.4) than for OEM BMW (3).
Engine radiator Koyo have better feature ratings than OEM BMW:
- Overheating - owners believe, that this property for Koyo is better than OEM BMW.
- Leaks - drivers claim, that this property for Koyo is outperforms OEM BMW.
- Sweet smell - reviews suggest, that by this property Koyo does not differ from OEM BMW.

Which engine radiator are more popular — Koyo or OEM BMW?

In March 2026 on PartReview, engine radiator Koyo were overall more popular than OEM BMW.

By vote balance, engine radiator Koyo surpassed OEM BMW:

For Koyo, the ratio of positive (160) to negative (13) votes is 147 votes.
For OEM BMW, the ratio of positive (31) to negative (25) votes is 6 votes.

By number of reviews, engine radiator Koyo surpassed OEM BMW:

For engine radiator Koyo there are 57 reviews: 52 positive, 2 neutral, 3 negative.
For engine radiator OEM BMW there are 18 reviews: 9 positive, 2 neutral, 7 negative.

Which engine radiator do car owners prefer — Koyo or OEM BMW?

In March 2026, according to PartReview, engine radiator Koyo led more car-specific ratings than OEM BMW:

Koyo are chosen by owners of cars such as: Honda S2000, and others.

Engine radiator OEM BMW have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.

Other comparisons of engine radiator

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

For example, comparisons of engine radiator Koyo with: MISHIMOTO, Nissens, KOYORAD, Denso, OEM Volkswagen, VALEO, OEM Toyota.

Also available: comparisons of engine radiator OEM BMW with: MISHIMOTO, Nissens, KOYORAD, Denso, OEM Volkswagen, VALEO, OEM Toyota.

You can also see who is better among other engine radiator manufacturers: MISHIMOTO or Koyo, MISHIMOTO or Nissens, MISHIMOTO or KOYORAD, MISHIMOTO or Denso, MISHIMOTO or OEM Volkswagen.