2017 Ford Explorer Transmission Fluid & Service

Quick answer

• Transmission Make/Model: Ford 6F50/6F55 (often referred to generically as a 6-speed automatic)
• OEM Fluid Spec: MERCON® LV Automatic Transmission Fluid
• Drain & Fill Capacity: Approximately 6.0 - 7.0 quarts (varies slightly by driveline and remaining fluid)
• Full Overhaul Capacity: Approximately 10.0 - 10.5 quarts (dry fill)
• Filter OEM Part Number: Verify with Ford dealer or service manual (typically integrated within the pan or valve body for these transmissions)
• Recommended Service Interval: Every 30,000 miles for severe duty/towing, 100,000 miles for normal duty (inspection at longer intervals)

Fluid type explained

For your 2017 Ford Explorer, the transmission utilizes MERCON® LV Automatic Transmission Fluid. The "LV" stands for "Low Viscosity," a crucial characteristic for modern automatic transmissions designed for improved fuel economy and efficient operation. Using any other fluid type, such as the older MERCON® V, can lead to significant transmission problems, including harsh shifts, slippage, overheating, and ultimately, premature transmission failure. Always ensure that any fluid you purchase explicitly states compatibility with MERCON® LV specifications. This fluid is formulated with specific friction modifiers, anti-wear agents, and detergents to meet the precise demands of the Ford 6F50/6F55 transmission.

Service procedure

The most common transmission service procedure is a drain and fill. This involves draining the transmission fluid from the pan, replacing the filter (if accessible and serviceable without disassembling the transmission), and refilling with new fluid. It's important to note that a drain and fill typically replaces only about 50-70% of the total fluid volume, as a significant amount remains in the torque converter, cooler lines, and other internal components. Because of this, some technicians recommend two or three drain and fills in succession, with some driving in between, to dilute the old fluid more effectively.

A full fluid exchange, also known as a fluid flush, aims to replace nearly all of the transmission fluid. This is typically performed using specialized equipment that connects to the transmission cooler lines, pushing new fluid through the system while simultaneously evacuating the old fluid. While a full flush can be very effective at replacing all the fluid, it's a controversial topic. If a transmission has very high mileage and has never had its fluid changed, a flush can sometimes dislodge accumulated debris, leading to blockages and potential issues. For this reason, many manufacturers and professional technicians recommend regular drain and fills over flushes, especially if the service history is unknown or neglected.

For the 6F50/6F55 transmission in the 2017 Ford Explorer, the transmission filter is often an internal component, sometimes integrated into the pan itself or not designed to be easily replaceable without major disassembly. Always consult your service manual or a qualified technician to determine if a filter change is part of a standard drain and fill for your specific vehicle configuration. If the filter is not easily accessible, a drain and fill is still beneficial for introducing fresh fluid.

Service interval

Ford specifies different service intervals depending on driving conditions:

• Normal Duty: For most drivers under regular conditions, Ford recommends inspecting the transmission fluid at 100,000 miles and changing it if necessary. However, many transmission experts and ASE-certified technicians advocate for earlier changes to extend the life of the transmission.
• Severe Duty/Towing: If your 2017 Ford Explorer is frequently used for towing a trailer, hauling heavy loads, extensive idling, driving in hilly or mountainous terrain, or operating in extreme hot or cold climates, the transmission is undergoing significantly more stress. In these "severe duty" conditions, it is strongly recommended to change the transmission fluid and filter (if applicable) every 30,000 miles or 3 years, whichever comes first. This proactive approach can prevent premature wear and maintain optimal transmission performance.

Regular fluid inspection is crucial. If the fluid appears dark, has a burnt smell, or contains metallic particles, it\