Small oil leak or just old residue?

It did small oil leak or just old residue twice this week, both times after sitting. No change in mileage feel. Only after sitting overnight so far.

Intermittent stuff lies if you only catch it once. Move a coil or plug on the 2023 BMW M340i if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. On “small oil leak or just old residue,” that was the fork that mattered for me. Take it or leave it — that's what I'd do. Doing the boring step first on purpose.

I wouldn't throw parts yet. Loaded-suspension checks on the 2023 BMW M340i catch play that a wheels-hanging inspection misses. Don't erase codes until someone who can help has seen them. Verbal 'we'll take care of it' is not a plan. I've seen both outcomes, which is why I'd test instead of assume. I'll update if anything new shows up.

This is usually cheaper to test than to guess. Get a real battery/charging test on the 2023 BMW M340i, not just resting voltage, before blaming a module. Don't erase codes until someone who can help has seen them. This is from a 2023 BMW M340i in Orange County. Post the numbers (or the code) and people can get more specific. Heat soak after errands is the other window.

OP update: scanned the 2023 BMW M340i again and still only have the one pending code, no new lights. Cold start is when I can actually reproduce it.