[amutti]

So I had the low coolant light come on around July 12, visibly verified low coolant and call the dealer. The earliest I could get in was today and they recommended I top off the coolant. Between both tanks I had to add more than 3 cups of coolant to get it above the minimum indicators in both tanks (most went in the main tank). Before bringing it in today I verified the coolant was again below the minimum indicator.

Dealer pressure tested and it passed. There is no visible coolant leaking anywhere, including around the coolant cap. They kept it overnight to "QC" it.?

Thoughts? Something else for them to check? 2021 m240i convertible. I read it could be nothing, leaking cap or being consumed by the turbo. I'm not sure the dealer would notice the internal leaking in the turbo.