Mine is a 2007 and has had almost zero problems for the last 5 years that I've owned it. I had to replace my radiator so far, and that's it.
My opinion koyo rad. But any with the heart symbol are favorites.
I’ve also personally had good luck with mishimoto.
It’s got an actual Koyo radiator which is a good sign.
My only recommendation after testing several different radiators is to go with Koyo.
I am running a nissen radiator, no issues 4 years in.
Use good quality maintenance items and replace anything worn out, nobody is going to give you marks off for Koni or Bilstein shocks, or radiator that isn’t Mazda original. Avoid obviously tacky/non standard looking cosmetic items, try to stick with parts that at last look like they could be part of a factory car.
I went with a Koyorad, but for how much I’ve spent, I should have gone with a crossflow (either Supermiata or Flyin Miata). I also did a coolant reroute, which made me really regret not getting a crossflow
I ordered a Denso radiator from RA earlier this year. Took my old radiator out of my truck before opening the new one (rookie move, I know). Well one of these fittings was bent/broken on the new one. Called every car parts store, mechanic, and radiator shop within an hour drive and no one had one. Someone finally pointed me towards a hydraulic shop and I had to have a guy there machine a new one for me. Been working without an issue. It was just crazy to me how difficult it was to find such a simple fitting.
You need to replace that. Bmws run hot. Only fix
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