![]() 1 (not DOT 5)Super high boiling points: Dry 617 degrees F, Wet 399 degrees F. The real differentiating factor is that DOT 4 fluid should be changed more often than a DOT 3 fluid, because of the effects and rates of water absorption. The New standard in high-performance brake fluid Mixes with DOT 3, 4 and 5. ic-White-Paper-D5-Brake-Fluid-Basics.pdf "A seldom talked about characteristic is that because of this chemistry, the DOT 4 fluid will have a more stable and higher boiling point during the early portion of its life, but ironically once the fluid does actually begin to absorb water its boiling point will typically fall off more rapidly than a typical DOT 3. ![]() As you can see, the DOT 4 has a higher boiling point for both dry and. The dry boiling point of DOT 4 fluid is 446☏ (230☌) and its wet boiling point is 311☏ (155☌). The dry boiling point of DOT 3 fluid is 401☏ (205☌) and its wet boiling point is 284☏ (140☌). It has to resist the moisture that can cause vapor lock brake failure, protect against corrosion, and withstand high. This refers to boiling brake fluid that has already absorbed water. Brake fluid is one of your cars most essential components. Castrol Dot 4 brake fluid is liquid engineered to prevent vapor lock and protect your brake system. FITS EVERYTHING Compatible with all DOT 3 and DOT 4 applications. HARSH CONDITIONS Offers low level of compressibility. PEACE OF MIND Matches needs of all DOT 4 manufacturer recommendations. Place your order online and pick it up at your local store for. On the other hand, I use Fram Ultra Guard filters for only one OCI, so don't believe any of my opinions, LOL. Dot 4 Brake fluid is an essential part of your cars brake system. PROTECTION Provides corrosion protection in brake components. Find the right Motorcraft 16 Ounce DOT 4 LV Brake Fluid for your vehicle at OReilly Auto Parts. I'm not convinced that DOT 4 is better in applications that don't recommend it. It always seems that DOT 4 recommends more frequent changing (again, correct me if wrong). While demarpaint states that it is slightly less prone to water absorption, my understanding (correct me) is that when it does absorb water, the boiling point drops off faster/more compared to DOT 3. I simply follow the owner's manual, which for me has always been DOT 3.
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