Antifreeze VALVOLINE or OEM Mazda

As you can see, straight from the jug, the Mazda coolant is resisting both corrosion and freezing better than the Motomaster.

I keep this in the trunk of my mk7. Haven’t had to use it, but I feel comfortable using it in emergencies

I'd say to change out the coolant, and transmission fluid. DO NOT GET A TRANSMISSION FLUSH!!! Just get a place to change out the transmission filter, and top off the transmission fluid.

Valvoline HT-12, because I can't find genuine BMW coolant in my country.

Yes I had low coolant in my brand new CX-30 and had to top it off 2-3 times with the FL22 fluid (factory OEM). I think some air is left in the system that gets out over time. Since then no issue with the coolant level

I had my AC condenser replaced and looked at it in the parking lot and confirmed it was full of coolant, drove home, and it was low. I ordered and added some OEM coolant at home. It's been fine ever since

Now running a Valvoline 50/50 mix with no issues

This is normal. Mazda master tech. I work on these everyday. Every oil change they need to be topped off. The coolant evaporates from the bottle pretty quick.

Valvolines is cross compatable

My 2017 CX-9 and it has a coolant leak from the back of the block by the manifold and the shop I took it to said to take it to a dealer.