You would need to have your entire system flushed in order to use this kind of fluid. However, being silicone-based means that you cannot mix DOT5 with the other Glycol Ether- and/or Borate Ester-based fluids. As per some manufacturers, it is recommended for cars that are stored for long periods of time as is the deal with classic cars. That’s the advantage of going for a DOT 3 fluid, it doesn’t absorb moisture as much as DOT4 and DOT5.1, but as mentioned, it has a lower boiling point, so its heat resistance isn’t the best.Ī special exception can be handed to DOT5 since it is silicone-based as to not absorb moisture. Even some cars have a traction control system that can also use the braking system, hence, going for a higher-grade fluid can benefit the system.Īlthough, if you do opt for a higher grade fluid except for DOT5, which is silicone-based, expect shorter longevity as the Glycol Ether and/or and Borate Ester, are prone to absorbing moisture, which means that if your car is stored for long periods of inactivity, or is heavily exposed to the elements, you may need a change sooner than later. ABS motors benefit more from DOT4 fluids and up since it will flow through the motor much easier. More and more modern cars that come standard with Anti-Lock Brakes Systems (ABS) can take DOT3 fluid but will benefit from DOT4 due to the fluid being less viscous. Another benefit that a higher grade has is a thinner fluid. Evidently, if you go up by whole numbers, from DOT3 to DOT4 or 5, the fluid is more heat resistant. Most braking systems are capable of using DOT3, however, going up in number means that the brake fluid has a higher boiling point, which means that a higher grade fluid can stand up to or have a more consistent feel even under heavier loads.
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