Engine radiator MISHIMOTO or Koyo

MISHIMOTO Engine radiator
Bicmeister12
  • Overheating:
Rating 4.5

I have a mishimoto radiator. At idle the highest I get to is 196 F then it drops down to about 185 F. While driving I’m usually averaging about 178 - 190 F if I’m not in stop and go traffic.

Pros: stable low temperatures
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Koyo Engine radiator
tblax44
  • Leaks:
Rating 5.0

I have a Koyo radiator on my 2019 and am really impressed with it. You get a thicker core and all aluminum construction so you don't have to deal with the metal/plastic interface of the OEM one that can crack/leak over time.

Pros: thicker core, all aluminum construction
Vehicle: Subaru
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Koyo Engine radiator
thedezz
  • Overheating:
Rating 5.0

I've been using an OEM style Koyo Radiator for the last 10 years on a clutch fan. Multiple track days and never any overheating issues.

Pros: no overheating issues, long-term reliability
Vehicle: Nissan
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Koyo Engine radiator

I opted for a stock replacement Koyo with the plastic end tanks again. It'll get you buy for another 10-15 years and 100k miles.

Pros: long lifespan, reliable
Vehicle: Subaru
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Koyo Engine radiator

I just bought a koyo and it's a bit of a learning curve installing it. It took a few hours to burp the system of air but now I'm chasing small leaks. The OEM cap doesn't fit the radiator

Cons: small leaks, OEM cap doesn't fit, difficult installation
Vehicle: Honda S2000
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