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Here is the first part of the problem: -- there are two -different- formulas for antifreeze/coolant that are used in modern automobiles: - GM-spec Dexcool, or Zerex-spec G05.
Here's the second part of the problem:-- if you mix Dexcool and G05, you end up with a semi-solid gel that will destroy your cooling system.
So what is in the Mazda6 as delivered from the factory?
Mazda is not telling; Ford is not telling.
There are several threads on this board that speculate on what the factory fill is. None comes to a conclusion that inspires confidence.
If you need coolant, you can take your Mazda6 to the Mazda dealership, and they will refill it from the unmarked barrel of Mazda coolant.
But what if you want to top off your coolant yourself?
If it is Dexcool in there, adding G05 will turn your coolant to gel, and could cause engine damage.
If it is G05 in there, adding Dexcool will turn your coolant to gel, and could cause engine damage.
Whatever is in there, it is a good idea to flush and replace every couple of years. That is what we are going to do next week in our '04 which still has the original factory fill.
Our instructions to the (independent) repair shop:-- after flushing, fill with Zerex G05. The consensus seems to be that G05 has a slight edge over Dexcool.
So what are the rest of you doing?