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In 2004, the Ford Expedition 5.4 requires Mobil 1 Synthetic Transmission Fluid Dexron/Mercon in one quart. To replace the transmission fluid, first ensure the vehicle is parked on level ground and raise the hood. Locate the transmission fluid reservoir, typically near the transmission, and find the dipstick. Remove it, clean it, reinsert it, and then pull it out again to check the fluid level. Take note of the amount and refill the container using a funnel until it reaches the full mark. A slight underfill is okay, but avoid overfilling. Close the container securely, and you're good to hit the road.
The 2004 Ford Expedition 5.4 requires a quart of Valvoline MaxLife synthetic transmission fluid for optimal performance.