DOT 4. DOT 4 is beginning to be used more widely in by vehicle manufacturers, but is used mostly by European car manufacturers currently. Although there are different types of DOT 4 brake fluid, it has a higher boiling point than DOT 3. DOT 4 Low Viscosity is used in some BMW models.

Brake fluid should be stored in its original container in a clean, dry location at or below room temperature preferably separated from similar storage of petroleum products or fluid materials used for maintenance purposes.

The primary differences between the two include the following: DOT 3 brake fluid will absorb less water than DOT 4 from the air over time, meaning you’ll need to have your fluid changed less frequently. DOT 4 brake fluid has higher dry and wet boiling points, making it safer for higher temperatures.

tl dr – Mixing Brand X fluid with Brand Y fluid is of no consequence, as long as you are mixing the same grade of fluid (DOT3, 4, 5, or 5.1). In order to be rated at a given grade, it must meet the prerequisites of the grade. This has to do with wet/dry boiling points, not who makes it.

Brands do not matter. Brake fluid is rather simple in design. Dot 3,4, and 5.1 can all be mixed. The difference is, as the number increases, so does the boiling point of the fluid.

Yes, DOT 3 brake fluid is compatible with DOT 4 brake fluid. However, DOT 4 offers a higher boiling point. DOT 5.1 is used in high-performance and heavy-duty applications due to its high boiling point. DOT 5 brake fluid is silicone, meaning it doesn’t absorb water.

You can use any DOT 3, DOT 4, or DOT 5.1 brake fluid without adverse effects; non-Honda fluid is fine.

DOT 3

As for brake fluid and other ones like that, sure Honda is always good to use, but not necessary and as long as you use a good quality aftermarket that meets the specifications you should be just fine.

Your Honda has plenty of get-up-and-go, but you also want to make sure it has plenty of stopping power. You should trade out your brake fluid at least every three years with Honda Genuine Brake Fluid because with lots of use it can become contaminated and lose effectiveness.

Like we said above, fresh brake fluid should be almost clear with a hint of yellow coloring. If your brake fluid resembles oil, and is a dark brown or black color, then you need a brake fluid flush and replacement.

The only recommended brake fluid for Acura vehicles. Either this or Honda HG DOT-3 fluid (the same fluid in different bottle) would do, but NEVER use other generic DOT-3.