Engine radiator MISHIMOTO or Koyo

PartReview Score

Rank #5 in ranking

3.5

Leaks

2.8

Overheating

4.1

Sweet smell

5.0

No data

PR Score

Ranking

Votes

Reviews

Average rating

Properties

Car

PartReview Score

Rank #1 in ranking

147

4.4

Leaks

3.6

Overheating

4.5

Sweet smell

5.0

Owners' choice:

Honda S2000

Reviews

All

MISHIMOTO

Koyo

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

MISHIMOTO › Engine radiator

manzin82 20 Jan 2026, 18:17

Leaks:

Rating 5.0

I got a Mishimoto with zero issues and fitment was spot on

Pros: zero issues, spot on

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

MISHIMOTO › Engine radiator

Keith_13 3 Jan 2026, 23:51

Overheating:

Rating 4.0

And don't put the oem radiator in (it sucks). A mishimoto is 2/3 the price, will last longer (it's not made of plastic at the top -- that's why the oem ones fail) and it will actually keep your engine a little cooler.

Pros: lasts longer, keeps cooler

Cons: oem ones fail

Vehicle: Subaru Impreza

MISHIMOTO › Engine radiator

brandothesavage 24 Dec 2025, 15:48

Leaks:

Rating 5.0

If u get a mishimoto it won't break again

Pros: durable radiator

MISHIMOTO › Engine radiator

Coupe368 2 Mar 2025, 17:42

Leaks:

Rating 2.5

The crap-tastic mishimoto MMRAD-E36-92 that I use these days do come with a lifetime warranty and I send them photos of the leak and they just send me a replacement in a week or so. I have purchased 6 of them and replaced 2 under warranty. The "Z3" raditator won't fit as its too thick, but the Z3 IS and e36 so its confusing.

Pros: lifetime warranty, easy replacement

Cons: crap-tastic, pinhole leaks, poor welds, Z3 fitment issues

Vehicle: BMW

Part number: MMRAD-E36-92

MISHIMOTO › Engine radiator

LolPandaMan 20 Feb 2025, 18:32

Overheating:

Rating 3.5

They're fine. They're one step above oem imo

Pros: one step above OEM

Vehicle: Mazda

MISHIMOTO › Engine radiator

TwOhsinGoose 28 Jan 2026, 17:59

Leaks:

Rating 1.0

My mishimoto radiator sprung a leak after 1.5 years in my F150. So good luck.

Cons: sprung a leak

Vehicle: Ford

MISHIMOTO › Engine radiator

Ok-Fish-9244 19 Dec 2025, 06:16

Overheating:

Rating 2.0

Get a csf or koyorad. Mishimoto isn’t that great

Cons: not that great

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Which engine radiator to choose — MISHIMOTO or Koyo?

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 MISHIMOTO and Koyo

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

Which engine radiator are better — Koyo or MISHIMOTO?

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

MISHIMOTO received a PR Score of 65 out of 100, and Koyo scored 92 points.
MISHIMOTO ranked 5 in the overall ranking, and Koyo ranked 1.
The average rating is higher for Koyo (4.4) than for MISHIMOTO (3.5).
Engine radiator Koyo have better feature ratings than MISHIMOTO:
- Leaks - owners believe, that this property for Koyo is better than MISHIMOTO.
- Overheating - drivers claim, that this property for Koyo is outperforms MISHIMOTO.
- Sweet smell - reviews suggest, that by this property MISHIMOTO does not differ from Koyo.

Which engine radiator are more popular — MISHIMOTO or Koyo?

Engine radiator MISHIMOTO and Koyo were equally popular according to data in March 2026.

By vote balance, engine radiator Koyo surpassed MISHIMOTO:

For MISHIMOTO, the ratio of positive (195) to negative (105) votes is 90 votes.
For Koyo, the ratio of positive (160) to negative (13) votes is 147 votes.

By number of reviews, engine radiator MISHIMOTO surpassed Koyo:

For engine radiator MISHIMOTO there are 95 reviews: 55 positive, 15 neutral, 25 negative.
For engine radiator Koyo there are 57 reviews: 52 positive, 2 neutral, 3 negative.

Which engine radiator do car owners prefer — MISHIMOTO or Koyo?

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

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

Engine radiator MISHIMOTO 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 MISHIMOTO with: Nissens, KOYORAD, Denso, OEM Volkswagen, OEM BMW, VALEO, OEM Toyota.

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

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