Perhaps something similar is happening on the B58? I'm not trying to be alarmist but BMW's history with coolant systems it amusingly terrible. The B58's air to water intercooler, which is built into the intake manifold, is much like the S55's in the M3 and M4 and I've seen pictures of coolant leaking from the M3/M4 air to water incooler into the intake runners. Some B58 owners have had their turbos replaced because BMW said the coolant was leaking into the turbo turbine and being consumed. B58 owners are reporting much larger losses. My Japanese cars don't have air tight expansion tank caps and they do loose water from the coolant over time, but we're talking 1/2 cup every 6 months. Sure, some vapor will be lost, but not that much. People claim that it's shoddy expansion tank caps releasing water vapor but i think that's BS. Where's the coolant going and why? Those are questions they should be answering, not just giving you a jug of coolant and sending you on your way. Not acceptable to me - and I don't even have my 240 yet. Should I fill it back up with 1:1 still, or would 1:2 coolant to water be better since its losing water and that would help to keep it 1:1 through the summer? Guess I will be checking it a bit more often now. area lately, so I can see how it would evaporate a little faster than normal in this heat and stop and go traffic. I started checking it more frequently since then.Ĭool. Apparently water evaporating as you mentioned. You will see that evident in the forums and I verified it with my service adviser. The week I had my first scheduled service, the light came on a few days before at 10,991 miles. ![]() Anyone else have similar issues? Going to have it check d out this week. I know I'll lose some water, even though it's a closed system, but this has me a little worried. With only 11,000 miles, this seems like a bit much. After it cooled down, I filled it up with about 24oz of coolant before it was back up to the proper level. While driving home from work, my low coolant warning came on in my M240xi.
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