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For the 2013 Kia Optima, it is recommended to use DOT 3 brake fluid. The fluid level in the reservoir should be maintained between the MAX and MIN markers. This fluid helps convert force into pressure, making it easier for you to stop your vehicle. When checking or topping up the brake fluid, make sure to clean the reservoir cap to avoid any contamination. The reservoir is located in the engine compartment on the driver's side towards the back. It is advisable to flush and add new brake fluid every 40,000 to 60,000 miles. The cost of the fluid typically ranges from $4 to $6 for a 12-ounce bottle, depending on where you purchase it.
The brake fluid specification for the 2013 Kia Optima is DOT 3.
For the 2013 Kia Optima, it is suggested to use automatic transmission fluid, specifically type-F, as the brake fluid.