Antifreeze OEM Mazda or OEM BMW

OEM stuff from BMW.

Only use bmw brand it has special additives for the electric water pump

Only the OEM bmw blue coolant. Don\u2019t use anything else.

BMW coolant; it\u2019s cheapish, certified, and you should need it again unless a leak issue.

The blue stuff is definitely better than the green from my experience. I use the overpriced bmw shit but I think you could probably use the cheap blue stuff just as well.

Don't buy BMW coolant it's overpriced just like everything else they sell. Blue coolant is preferred but the premixed green stuff isn't going to cause catastrophic meltdowns. My 97 328i has the green stuff and I've got no issues after 196k miles.

I always use the OEM coolant that I pay an arm and a leg for from the dealership. For a few dollars it’s not something I want to chance in vehicles (especially my E46) with such sensitive cooling systems.

Last time I priced FL 22 at the Mazda dealer it was about the same as AutoZone I was surprised I thought it would be considerably more.