How to Choose Antifreeze?

[McLawson]

The method for selecting antifreeze is: 1. Choose the freezing point based on the ambient temperature conditions where the car is used. The freezing point is a crucial indicator of antifreeze, and it should be approximately 10 degrees lower than the lowest winter temperature in the local environment; 2. Select antifreeze according to the specific requirements of different vehicles; 3. Choose antifreeze with rust-proof, anti-corrosion, and descaling capabilities. The functions of automotive antifreeze are: 1. To provide anti-corrosion protection for components of the cooling system; 2. To prevent scale buildup and avoid reducing the radiator's cooling efficiency; 3. To ensure the engine operates within the normal temperature range. Precautions for using antifreeze include: 1. Regularly check the antifreeze level and replenish it promptly if it falls below the lower limit; 2. Observe whether the antifreeze has any turbid sediments and replace it in time if there are any; 3. Different car models may have antifreeze of different colors, so they should not be mixed; 4. Before winter, measure the freezing point of the antifreeze to prevent it from freezing.

[McKingston]

Choosing antifreeze mainly depends on four key indicators. First is the freezing point—select a model that is at least 10 degrees lower than the historical minimum temperature in your area. I live in the north where winters reach -20°C, so I use antifreeze with a -40°C freezing point. Second, check the boiling point—protection during summer on high-temperature roads is crucial, so choose one with a boiling point above 130°C to prevent overheating. Third, consider the composition—I’ve long used organic acid-based long-life antifreeze, which lasts five years without replacement. It’s more expensive than ethylene glycol (which lasts two years) but more convenient. Fourth, it must match the original color of your car’s coolant—last time I mixed red and green, it clumped and clogged the pipes. I recommend buying reputable brands according to the maintenance manual specs—don’t go for cheap options at small shops. Also, regularly check the antifreeze’s condition; if it turns cloudy or discolored, replace it early.

[OGiselle]

Having repaired cars for over a decade, I'm most wary of vehicles with improperly used coolant. First, strictly follow the vehicle manual's specifications: Japanese cars mostly use red organic acid technology (OAT), while American vehicles typically require green silicate-based formulas. Mixing them can corrode radiators and engine blocks. Performance-wise, OAT formulas offer lifetime maintenance-free protection ideal for new cars, whereas older vehicles may opt for cost-effective phosphate-based variants. Critical packaging indicators: the freezing point should exceed your region's extreme temperatures by 15% as a safety margin, and the boiling point must reach at least 128°C to be effective. Maintenance intervals fall into two categories: OAT coolants last 5 years or 250,000 km, while conventional types require replacement every 2 years. Important reminder: after radiator disassembly/cleaning, completely drain old fluid before refilling - residual mixture lowers freezing protection. When topping up, always use identical type and color formulations, as different colored ion-based formulas trigger chemical reactions.

[DeGarrett]

Last time before racing, I specifically upgraded my coolant configuration. The first choice was professional track coolant with a boiling point exceeding 200°C to handle radiator boiling during continuous high RPMs. For daily driving, focus on three key parameters: freezing point should be 10°C lower than actual needs for antifreeze protection, boiling point above 130°C ensures summer traffic cooling, and a 50:50 water-to-coolant mixture ratio works best. Color matching with the OEM system is crucial—last time I temporarily added the wrong color, causing metal pipe corrosion and leaks. Recommended brands include BASF, Shell, and other major manufacturers' long-life formulas that can last five years. During replacement, ensure thorough flushing of old coolant as residue mixing reduces effectiveness. After aggressive driving, check fluid levels—high temperatures cause rapid evaporation, so timely replenishment prevents engine overheating damage.