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      12-13-2020, 08:50 PM   #27
drrust
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Drives: E90 M3 DCT Sedan
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Originally Posted by drrust View Post
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Ok, so I'll probably get 3 gallons to have on hand to make sure it's topped off.

Might be a good idea to flush the entire cooling system when approaching 100k miles anyway.
Remember it doesn't go in straight it is supposed to be a 50/50 mix with water. I with one gallon of coolant and the small thermostat replacement size, I was able to drain the radiator and refill, and have a bit leftover.

One item to consider is the radiator drain plug. It's made of plastic. I think there are metal ones available. Not necessary, but if you want to change it you can.
Indeed, I saw those metal drain plugs and bleeder bolts, and wondering/contemplating whether to install those.

What is the benefit of a metal drain plug? Why did BMW engineer plastic ones?
The plastic ones are adequate for what the do. It's not that the are a common failure item, from what I had seen. It seems that people fear that they will get brittle and break when taking them out.
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