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Volvo Antifreeze: Which Brand? Mix with Water?

Are there any advantages to the blue Volvo coolant? I’ve seen price raised as a major reason to go with Zerex G-05. In my area only a few places carry Zerex G-05 and it’s $19/gal. Volvo blue is $26.50.

Aside from not mixing different coolant types it sounds like coolant type doesn’t really make a difference.

That said, I’ll likely stick with either Zerex G-05 or Volvo blue.


Why Use Volvo Brand Coolant (Volvo Antifreeze)?

Actually, this is to be expected when one considers that ethylene glycol, the principal component of most antifreezes, freezes at 8 degrees above zero, Fahrenheit. It is only when water is added that the freezing point is depressed. The freezing point of an ethylene glycol and water mixture drops rapidly as the concentration of glycol is increased to a mixture of about 60% antifreeze and 40% water. Around that point, an abrupt turnabout occurs, and as more antifreeze is added, the freezing point rises almost as fast as it had previously dropped.

Fine with 50/50 mix really but with 70/30 I don’t have any leftover coolant to lay around my garage. Straight antifreeze in a big no-no.


Antifreeze: brands and underlying theory

What about Prestone?

Have used Prestone in many Volvos and BMWs for 20 years zero issues.

If you want to see the inside of the engine block of my 1998 BMW 528i with 160K miles (always had Prestone for > 10 years, changed every 3 years or so), see the photo.

So stop the worry, buy the Green Prestone at local Walmart for $13/gallon, mix with distilled water and move on.
If you feel that Volvo coolant is better, then by all means buy the Volvo coolant, I don’t b/c I don’t give in to “fear” created by car mfg’s.

People who bash Prestone saying it is used for American cars (American engines worse than Volvo engine???) and boats etc. don’t know what they are talking about. Prestone is a reputable company.

E39 Cooling
E39 Cooling

Antifreeze Theory

If you have a non turbo car then you can use the regular Prestone. Prestone is an OAT technology (Organic acid technology) coolant. A Hybrid OAT (a mix of oat and other ingredients )is called a HOAT- Hybrid OAT. A HOAT is used in modern diesel engines and other turbos as well as all BMW and Mercedes. (Did you ever notice that BMW coolant and Volvo coolant are exactly the same?). Volvo HOAT contains Sebacic acid and some silicates on top of the normal OAT ingredient of 2 -EHA . These are the chemicals that make a difference o keeping it from boiling over and repairing damage to aluminum at a molecular level.


Antifreeze: brands and underlying theory

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My coolant is leaking from my car… BUT has not over heated. I need to know how I fix my leak. It was barely leaking. I just kept adding coolant. I need to know how to fix this problem. I took it to the shop but they couldn’t figure it out either. Should I just repair my radiator? or just seal it? – Thank You

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