M52 replaced by e30. I was skeptical about ordering from Amazon after reading reviews that the reservoir return hose didn't fit. I had zero problems. I saved a few bucks by ordering through Amazon and the product is as beautiful as I expected from Mishimoto. Cooling with this cooler goes beyond the MZ3 cooler with the replaced E30. I increased the clearance to the motor by an inch which reduced heat absorption etc since the three rows are so close to the motor. Sometimes less is more. I will never use a 3 row engine in my replaced e30 ever again. Heat treatment is real. Trying to trump the Bmw engineer in this department, whatever the exchange, is futile. This cooler meets cooling needs beyond my m52b28. Do not operate non-genuine thermostat. Even when driving hard, I can't get the car up to temperature with an 80d thermostat. If you use this radiator, install the stock thermostat.
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