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What is DOT4 oil?

1 Answers
VanCaroline
07/30/25 2:25am
DOT4 is brake fluid. Here are the specific details about DOT4: Introduction: DOT4 ester-based brake fluid is based on DOT3 alcohol-ether type with the addition of a large amount of borate ester, resulting in a higher boiling point than DOT3. Borate ester has strong moisture resistance, which can decompose absorbed water, thereby slowing down the boiling point drop caused by water absorption. Usage: If DOT5 brake fluid is used in daily driving, it must be replaced every six months; otherwise, there are safety hazards. For general vehicles, DOT4 is sufficient, and it is generally recommended to replace it every two years. In rainy southern regions or areas where wheels are frequently submerged in water, it is advisable to replace it earlier.
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