Engine radiator Koyo or Nissens

I've recently replaced my original oem one with Nissens, no issues so far, works perfectly. it was a super easy install and no issues so far.

Go for a Koyo and never look back.

I got a Nissens radiator in mine after it had to be replaced last year, and it’s been serving me very very well

The Nissens are inexpensive and mine has been trouble free for ten years.

I put a Nissens in my 1992 325i cabrio and it fit perfectly. It’s been in there for seven years now and all is great. My car was an automatic when I bought the radiator. I later had the car swapped to manual and plugged off the transmission cooler ports on the radiator.

just replaced rad and all soft and hardlines with oem hoses and koyo rad. gives me a lot of reassurance in this LA heat. Great upgrade

The Koyo Rad needs it's own custom cap as the OEM won't fit but man does track city daily without issue and fits OEM fans it's a must have.

The previous owner had replaced it with a really cheap plastic tank one. It started leaking about a month after I got the car so I spent the money and got an all aluminum Koyo. Its a happy miata now.

Koyo rad hands down best aftermarket replacement.

I recently installed a Koyo radiator in my s13 to replace the stock one that had been leaking. I bled the air thoroughly when I filled the system with a spill free funnel and the bleed screw on the water outlet. Even after doing this, my car started overheating intermittently after driving around for a bit. When I stopped, the upper hose and radiator were very hot but the lower hose was cool to the touch. I tried to bleed more air out of it with the spill free funnel, but no air came out, and the water in the funnel started getting hot and overflowing. I pulled the thermostat to verify if it's functioning properly and it is, also it's the type that will stay open in the event of failure. This might seem silly, but I feel like the thermostat is closing and opening because the radiator is cooling too well.