2018 Infiniti Q50 — coolant slowly disappears without an obvious leak

If it were in my driveway, loaded-suspension checks on the 2018 Infiniti Q50 catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. This is from a 2018 Infiniti Q50 in Northern Virginia with 87,500 miles. Keep sale price, fees, and rate as three different conversations. I'd rather be boring and correct. If the story changes I'll post the new data.

It did coolant slowly disappears without an obvious leak twice this week, both times after sitting. No change in mileage feel. I refuse to clear codes until someone else sees them.

OP update: scanned the 2018 Infiniti Q50 again and still only have the one pending code, no new lights. I keep a notes app thread for this now.

I wouldn't throw parts yet. Move a coil or plug on the 2018 Infiniti Q50 if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. That's the whole play. No warning lights, which is why I'm documenting it.

I'd want a measurement, not a hunch. Swap the cheap/easy piece first on the 2018 Infiniti Q50 and see if the fault moves. If the cheap test changes it, stop and reassess. Post the numbers (or the code) and people can get more specific. I'm in no rush to be a hero on it.