Mopar DOT 3 Brake Fluid: Specifications and Vehicle Compatibility
What Mopar DOT 3 brake fluid is
Mopar DOT 3 brake fluid is a glycol-based hydraulic brake fluid sold under the Mopar brand for Chrysler, Dodge, Jeep, Ram and related vehicles. DOT 3 is a performance classification defined by the U.S. Department of Transportation, not a chemical formula unique to one supplier. The key requirement is minimum dry boiling point, usually stated as 401 degrees Fahrenheit or 205 degrees Celsius, and minimum wet boiling point, usually stated as 284 degrees Fahrenheit or 140 degrees Celsius. Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time, so its boiling point gradually moves from the dry figure toward the wet figure.
Specifications vary by product bottle
Mopar offers more than one brake fluid product, so a blanket specification is not reliable. The part marketed as Mopar Brake Fluid DOT 3 is commonly associated with part number 04318080AB, but packaging and formulations can change by market and production period. Some Mopar brake fluid containers are labeled as meeting Motor Vehicle Safety Standard No. 116 for DOT 3, while other Mopar fluid may be labeled DOT 4 or as a DOT 3 and DOT 4 compatible product. Check the actual bottle or the official parts listing for the model year and VIN before treating one part number as equivalent to another.
Where Mopar DOT 3 is used
DOT 3 has been the factory fill on many older and some newer Chrysler-family vehicles where DOT 3 is specified in the owner's manual. This can include models from the Chrysler, Dodge, Jeep and Ram brands. The fluid is also used in hydraulic clutch systems on vehicles that share the brake fluid reservoir or specify the same fluid for the clutch circuit. Using a compatible DOT 3 fluid is generally acceptable when DOT 3 is specified, but the approval belongs to the vehicle specification, not to the Mopar brand name alone.
Compatibility with newer vehicles
Many recent vehicles specify DOT 4, which has a hotter boiling point and is better suited to higher thermal loads. A vehicle that specifies DOT 4 should normally use DOT 4 or a fluid that clearly meets the minimum DOT 4 requirements, not an older DOT 3 product. Confirm the requirement in the owner's manual or on the master cylinder reservoir cap. Aftermarket brake fluids sold as DOT 3 and DOT 4 or higher may exceed the basic DOT 3 requirement, but verification should come from the printed specification and compatibility claim on the candidate product.
What to check before topping up or changing fluid
Before buying Mopar DOT 3 brake fluid, confirm four things: the DOT rating required for the vehicle, the capacity needed for a flush, whether the brake and clutch share a reservoir, and whether the fluid is fresh or already opened. Brake fluid absorbs moisture once a container is opened, so use a sealed container and avoid storing half-used bottles indefinitely. A low fluid level can also be a sign of worn brake pads or a minor leak, so inspect the braking system level and condition rather than simply adding fluid.
Suggested replacement interval
A common replacement interval is every two to four years or according to the servicing schedule in the owner's manual, but this varies by vehicle and operating conditions. Brake fluid should be tested for moisture if the correct test equipment is available. The absence of a stated interval in some sources is a gap rather than a reason to ignore fluid condition. Always follow the vehicle's documented maintenance schedule.
Bottom line
Mopar DOT 3 brake fluid is a conventional glycol-based DOT 3 product intended for vehicles that specify DOT 3. The practical decision is not brand loyalty but specification matching: use fresh, sealed fluid that meets the DOT requirement listed for the vehicle, and verify the actual Mopar part and label when a specific replacement is required.