2004 Mazda 6 Sport Wagon
3.0L Auto 5 Speed Semi Automatic

Any suggestions on Cooling System antifreeze?

Living in Canada 🇨🇦, temps in winter can drop to -35 in the winter and summer +30 Celcius.
Any recommendations on Coolant?

Ron🇨🇦
Appreciate everyone here 👍

Hey Ron. I have always used the Mazda OEM coolant. 0000-777-505E-20
I have only found two others that meet the specs but haven't used them.
The ASTM D3306 is easy to meet as that is just the ethylene glycol formulation.
The ASTM D4340 is harder and I feel quite important as it pertains to the high heat aluminum corrosion resistance needed for the cylinder heads.
NAPA Extended Life Orange Cooling System Antifreeze
and
PEAK Cool Extended Life Orange Concentrate - PRA0L3

There may be others but I have not called manufacturers and only go my their published data sheets.

Good luck.

 

Hey Ron. I have always used the Mazda OEM coolant. 0000-777-505E-20
I have only found two others that meet the specs but haven't used them.
The ASTM D3306 is easy to meet as that is just the ethylene glycol formulation.
The ASTM D4340 is harder and I feel quite important as it pertains to the high heat aluminum corrosion needed for the cylinder heads.
NAPA Extended Life Orange Cooling System Antifreeze
and
PEAK Cool Extended Life Orange Concentrate - PRA0L3

There may be others but I have not called manufacturers and only go my their published data sheets.

Good luck.

Thanks a million my friend 👍🇨🇦
Looking at this :

 

Hello again,
What's your thoughts on these from Prestone?
Ron🇨🇦

 

Hey Ron. None of them "officially" match the recommenced ASTM for aluminum corrosion but they are said to be rated aluminum compatible. With the amount of newer engines that have aluminum I can't imagine they will cause damage before something else take the car old out.

 

Hello , so the cooling issue seems to be resolved. I used the Prestone Max and let the thermostat cycle 3 times : open then closed. The fans come on at 100deg Celcius and temp goes down to 95 (car parked at idle), burping the system to get air out. No leaks, plenty of heat.
Replacing all the brakes now
Wish me luck 🤞 😜🤣
Ron🇨🇦