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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Mechanical Maintenance and TSBs: Break-in / Oil & Fluids / Servicing / TSBs and Service Bulletin > Coolant Colour
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      06-30-2022, 09:30 AM   #1
Kanye
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Coolant Colour

I have a the b38 engine

I noticed that the coolant level was a bit under the minimum, so I went ahead and bought some coolant from bmw (HT-12) and topped it off. However, I noticed that the colours (both green) don't exactly match. Could this just be due to the old coolant aging and breaking down? or could this mean I have a different brand of coolant in my car?
Keep in my mind it's very hot where I live.


Old on the left, New on the right:



I remember when i bought the car in feb 2021 I could see the coolant's colour in the expansion tank from the outside (don't remember if it was green or blue though), but based on that I would guess that the tank was replaced around that time and a coolant flush was done.
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      06-30-2022, 09:51 AM   #2
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Perhaps the old coolant was watered down. I can see that in a climate where freezing isn't a concern, to save money, but it's a bad idea. Watered down coolant has a lower boiling point than a proper 50/50 mix.

Or that's brake fluid.
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      06-30-2022, 10:21 AM   #3
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I only took out a small amount and the bottle wasn't completely dry thats why it's watery.

I'm more concerned about having prestone or some other brand and having added in a different kind of coolant.
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      06-30-2022, 01:33 PM   #4
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The brand doesn't matter, so long as it's the correct formulation. Your manual should say what that is.
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      06-30-2022, 04:59 PM   #5
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That's exactly the issue. I know exactly what should be in it, I just don't know what's currently in it. I guess I'll just have the guys at the dealership check during the next service.
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