2017 Ford F-350 Super Duty Transmission Fluid & Service

Quick Answer

• Transmission Make/Model: TorqShift 6R140 (6-speed automatic)
• OEM Fluid Spec: MERCON LV Automatic Transmission Fluid
• Drain & Fill Capacity: Approximately 7.6 quarts (7.2 liters)
• Full Overhaul Capacity: Approximately 17.5 quarts (16.6 liters)
• Filter OEM Part Number: BC3Z-7A098-A (verify with dealer or service manual)
• Recommended Service Interval: 90,000 miles (normal duty) or 60,000 miles (severe duty/towing)

Fluid Type Explained

The 2017 Ford F-350 Super Duty with the 6R140 TorqShift transmission relies exclusively on MERCON LV Automatic Transmission Fluid. "LV" stands for Low Viscosity, and this fluid is specifically formulated to meet the demands of modern transmissions, offering improved fuel economy and enhanced durability. Using any other type of transmission fluid, such as older MERCON V or MERCON SP, can lead to severe transmission damage and void your warranty. Always ensure that any fluid you purchase explicitly states it meets the MERCON LV specification. While aftermarket fluids exist that claim to be compatible, for ultimate peace of mind and to maintain the integrity of your transmission, using genuine Ford MERCON LV fluid is highly recommended.

MERCON LV is a full synthetic fluid designed for extended service life and superior performance in extreme temperatures. It provides excellent wear protection, maintains proper friction characteristics for smooth shifts, and helps prevent sludge and varnish buildup within the transmission. Its low viscosity contributes to less parasitic drag, which can translate to better fuel efficiency.

Service Procedure

Servicing the 6R140 transmission typically involves two main methods: a drain and fill or a full fluid exchange (flush).

Drain & Fill

A drain and fill is the most common and straightforward service procedure. It involves draining the fluid from the transmission pan and refilling it with new fluid. For the 2017 F-350 Super Duty, a typical drain and fill will replace approximately 7.6 quarts (7.2 liters) of fluid. This method is effective for routine maintenance and helps to replenish a significant portion of the old fluid with new, clean fluid. It is crucial to use the correct MERCON LV fluid and to ensure the transmission fluid level is checked accurately while the transmission is at operating temperature, typically between 195-205°F (90-96°C), and the vehicle is on a level surface.

During a drain and fill, it's also the ideal time to replace the transmission filter. The OEM filter part number for the 6R140 is BC3Z-7A098-A. Always verify this part number with your dealer or a service manual specific to your truck's VIN to ensure you have the correct component.

Full Fluid Exchange (Flush)

A full fluid exchange, often referred to as a "flush," involves using specialized equipment to completely replace all the old transmission fluid with new fluid. This process typically replaces closer to the full overhaul capacity of approximately 17.5 quarts (16.6 liters). While a full flush can be beneficial for thoroughly cleaning out the transmission and ensuring nearly 100% new fluid, it