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      02-02-2019, 08:57 AM   #79
ztx84
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Drives: 2022 M4 Competition Xdrive
Join Date: Jan 2018
Location: Devon, UK

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I've had a bit of an idea about why all sorts of our engines are losing a bit of coolant over time. I was sorting out my engine bay today, giving it a bit of a clean and topping up screenwash and I noticed that the coolant reservoir is formed in two parts - a lower section, and then an upper section with the cap. At the join level I could see a very very small amount of residue, suggesting that liquid was perhaps escaping between the two sections. It was only a very small amount, and that would tally with the level only dropping just a bit over time... What do others think? Could this be a potential reason for coolant loss particularly in the B58 engine?
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