2015 BMW 335i — coolant slowly disappears without an obvious leak

I went back under the 2015 BMW 335i and it only happens after a heat soak, not on a cold start. I'd rather pay for diagnosis than a second guess-repair.

Log the conditions before you spend. Loaded-suspension checks on the 2015 BMW 335i catch play that a wheels-hanging inspection misses. Save the big job until that test fails. On “coolant slowly disappears without an obvious leak,” that was the fork that mattered for me. Keep sale price, fees, and rate as three different conversations. If it repeats twice more I'll book time.

Start with the test that can prove you wrong. Loaded-suspension checks on the 2015 BMW 335i catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. Verbal 'we'll take care of it' is not a plan. That's my plan before I call anyone.