Antifreeze, also known as coolant, is vital for regulating your engine’s temperature. But with different types available, like the common red and green antifreeze, what happens if they mix? This article explores the potential consequences of combining these two coolants.
Chemical Reactions and Corrosion
While not literally turning your coolant into acid, mixing red (often Dex-Cool) and green antifreeze can alter the chemical balance. Dex-Cool utilizes organic acid technology (OAT), while traditional green coolants often rely on silicates for corrosion protection. Combining these can lead to precipitation, reducing the effectiveness of corrosion inhibitors and potentially increasing acidity. This reaction can compromise the cooling system’s ability to protect vital engine components, particularly aluminum, making them vulnerable to corrosion.
One study indicated a possible link between mixing coolants and aluminum corrosion under specific conditions. While some sources suggest mixing only reduces the coolant change interval, other evidence points to more severe consequences. Numerous reports detail head gasket issues arising after mixing red and green antifreeze.
Conflicting Information and Recommendations
General Motors (GM), the developer of Dex-Cool, has offered seemingly contradictory advice. While stating that mixing green coolant with Dex-Cool only shortens the change interval, GM also advises consulting the owner’s manual for the correct coolant type and warns against mixing. This conflicting information underscores the importance of understanding the specific requirements of your vehicle’s cooling system.
Manufacturer Guidelines and Best Practices
The safest approach is to follow your vehicle manufacturer’s recommendations for the correct antifreeze type. Mixing coolants, even if seemingly harmless in the short term, can lead to long-term damage and costly repairs. If you’re unsure which coolant your vehicle requires, consult your owner’s manual or a qualified mechanic. Proper maintenance and using the correct antifreeze will help ensure your engine’s longevity and optimal performance.
