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.
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If choosing antifreeze across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare antifreeze across these categories:
In March 2026 on PartReview, antifreeze VALVOLINE were overall better than OEM Mazda.
In March 2026 on PartReview, antifreeze VALVOLINE were overall more popular than OEM Mazda.
By vote balance, antifreeze VALVOLINE surpassed OEM Mazda:
By number of reviews, antifreeze VALVOLINE surpassed OEM Mazda:
In March 2026, according to PartReview, antifreeze VALVOLINE led more car-specific ratings than OEM Mazda:
VALVOLINE are chosen by owners of cars such as: Volkswagen Passat, and others.
Antifreeze OEM Mazda have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of antifreeze VALVOLINE with: Prestone, PEAK, Pentosin, OEM BMW, OEM Volkswagen, OEM Toyota, OEM Honda.
Also available: comparisons of antifreeze OEM Mazda with: Prestone, PEAK, Pentosin, OEM BMW, OEM Volkswagen, OEM Toyota, OEM Honda.
You can also see who is better among other antifreeze manufacturers: PEAK or Prestone, Pentosin or Prestone, Prestone or VALVOLINE, Prestone or OEM BMW, Prestone or OEM Volkswagen.
