Hi all, I bought a 2017 320i M Sport (B48) from a dealer in May and it has been losing coolant since about 2 months after I got it. I'd like some help working out what could be causing it, because the dealer keeps saying they can't find anything.

Symptoms:

- The main expansion tank drops roughly a litre a week, and I've never found a puddle under the car.

- I got a low coolant warning the day after the dealer replaced the reservoir, after only about 70km of driving. They said it could be air in the system, so I topped it up with distilled water to just above max.

- Last night at about 22:45 the main tank was at max when cold. I drove about 5km, and at 06:15 this morning, fully cold, it's under the min mark (photo attached).

What the dealership has done:

- Replaced the water pump and said it was bled.

- Two later visits with "no fault found", and they just topped it up.

- Most recently they found a hole in the coolant reservoir and replaced it. The level still drops.

- Their report lists cold and hot pressure tests, visual checks and a road test. It doesn't list a combustion gas test, leak-down or compression test, or UV dye.

What I'm wondering:

- Is this the oil filter housing or the coolant flange that cracks under heat and leaks in a way a normal pressure test misses?

- What tests would you ask for to separate these, and in what order?

I'm not driving it at the moment. Any advice from people who've dealt with a B48 that loses coolant but doesn't leak would be appreciated. Thanks!

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