My koyo was bought secondhand, has done many track days and 40k street miles over 5 years, and I even accidentally tried to jack up the car with it. It's still going fine.
I also replaced the radiator (I went Denso, not oem). It\u2019s gxor-ish recommended preventative maintenance every 100k.
I spent two years (off and on, as it only overheated when idling in 90+ degree conditions or when doing low-speed jeep trail climbing in the heat) chasing this on my rig. Over time, replaced fluid, thermostat, radiator cap, clutch fan. No joy. Finally pulled the radiator, and the front fins were horribly blocked. Replaced with a new Denso, and problem solved. Only issue with the new Denso was that the mounting rails on the new radiator were shite, but it was a matter of four bolts to swap over the old rails (with upper shroud still attached) to the new radiator.
I use nissens brand rad (Danish manufacturer) and so far so good.
I’ve got Mishimoto’s X-Line radiator. It’s an absolute beast of a rad. I’ve had mine for 7 years of daily driving and track days, and I’ve had zero problems with it. I fully expect it to last for the life of my M3.
Not everyone has great things to say about Mishimoto rads, but from what I can tell their X-Line rads are built very well.
I put mine in about 6 months ago. Been great!
Some of the smaller engines are crap and give the p1 platform a bad name... I'm looking at you 1.6d ????
T5's require maintenance but are pretty bulletproof. In 5 years of ownership the only time the car has let me down was a radiator leak.
N54 335i - 200k miles radiator upgraded
I recently put in a brand new mahle behr rad in, only 8k in and it’s got a leak on the driver side in the plastic tank.
I’m on my 3rd Mahle for my N54. If I did it again I’d go OEM.
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