Difference Between G12 and G13 Antifreeze

2 Answers
NoraMarie
07/29/25 6:35pm
Volkswagen has two types of antifreeze, namely G12 and G13. Below are the main differences between the two: 1. Performance: Both have the same functions of antifreeze, anticorrosion, and anti-boiling. 2. Color: There is not much difference in color. 3. Usage: For Volkswagen vehicles, those manufactured before 2018 generally use G12 antifreeze, while those manufactured after 2018 mostly use G13 antifreeze as original equipment. 4. Ingredients: G13 antifreeze contains additional chemical agents to prevent leakage compared to G12. If there is a minor leak in the cooling system, it may not require repair as the antifreeze can automatically seal the leak point.
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OMarcus
08/14/25 11:44am
With over a decade of car repair experience, I've gained some insights into coolant differences. The key distinction between G12 and G13 lies in their chemical formulations—G12 uses organic acid corrosion inhibitors, offering good compatibility but potentially causing slight corrosion in older aluminum engines. G13 upgrades with phosphate additives specifically designed to enhance protection for modern vehicles' aluminum alloy components, preventing leaks and scale buildup. During routine maintenance, never mix these two types as sediment may clog the cooling system and cause engine overheating. Owners are advised to prioritize G13 coolant, especially for post-2010 vehicles, with replacement intervals typically every two years or 60,000 km. When inspecting coolant, always check the radiator condition to ensure no rust or contaminants exist. These tips can save you from repeat repairs and significant costs.
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