![]() Have used Prestone in many Volvos and BMWs for 20 years zero issues. voodoorobazĪntifreeze: brands and underlying theory What about Prestone? 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.įine with 50/50 mix really but with 70/30 I don’t have any leftover coolant to lay around my garage. 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. It is only when water is added that the freezing point is depressed. 1997volvo850 Why Use Volvo Brand Coolant (Volvo Antifreeze)?Īctually, this is to be expected when one considers that ethylene glycol, the principal component of most antifreezes, freezes at 8 degrees above zero, Fahrenheit. That said, I’ll likely stick with either Zerex G-05 or Volvo blue. Volvo blue is $26.50.Īside from not mixing different coolant types it sounds like coolant type doesn’t really make a difference. In my area only a few places carry Zerex G-05 and it’s $19/gal. This is why replacing the coolant at the recommended interval is critical.Are there any advantages to the blue Volvo coolant? I’ve seen price raised as a major reason to go with Zerex G-05. It rises dramatically in a short period of time the moment the buffers are fully depleted. When these chemicals become depleted, the pH can’t be controlled. These changes make choosing the correct coolant difficult.Ĭoolant contains additives called buffers that keep it at a neutral pH, but these buffers aren’t meant to last forever. Some of these changes were to increase maintenance intervals, but the majority of the advancements were in response to changing engine technologies. The chemistry of coolants and additive packages have changed. Is G-48 better than G-40? No, it just meets a different set of requirements. New G-48 coolants are ethylene glycol based and contain nitrite, phosphate and other chemicals. ![]() ![]() The latest specification is G-40 for SiOAT. Many of these coolants can meet G-12++, G-13 and specific manufacturer formulations. SiOAT coolants can last between 125,000 to 150,000 miles. This typically pink coolant includes silicates in the additive package. In Europe, silicone organic acid technology (SiOAT) started to come in 2010 and newer vehicles. HOAT coolants meet G5, G11 and G12 specifications and may be yellow or orange in color. The HOAT coolant was used by both European and Asian manufacturers. The next step was hybrid organic acid technology (HOAT) that had higher concentrations of silicates to protect the aluminum. In Europe, extending the coolant replacement interval reduced the environmental impact of the vehicle. Other changes in chemistry took place to reduce chemicals that could contaminate the catalytic converter, since most OEMs were on the hook for a 100,000-mile emissions warranty. Also, on the intake, many OEMs switched to carrier-style gaskets that used a plastic frame. Many switched from fiber head gaskets to multi-layer steel (MLS) head gaskets. Other changes in coolants were made to protect gaskets and components to compensate for the different rates of expansion. In the late 1990s, most global manufacturers switched to organic acid technology that offered a longer replacement interval. But, they had a limited lifespan of 30,000 miles. Most of these coolants used inorganic acid technology and worked great for almost 30 years. But, these coolants also were designed for aluminum and bi-metal engines. ![]() These coolants were designed for a European market where the tap water contained more trace minerals. In the beginning, many European vehicles came with blue coolant. ![]()
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