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The 2000 Ford F-150 requires Mercon V transmission fluid, so you will need to search for Dexron III or Mercon when purchasing it. This type of fluid can be found at various retail outlets, including auto shops and online stores, with prices typically ranging from $4 to $14 per bottle. To change the fluid, start by checking the reservoir's fill level and ensuring it is completely empty. Then, unscrew the cap from the reservoir and use a funnel to carefully fill it with the new fluid until it reaches the designated fill line, which should be around 4 quarts. Once filled, screw the cap back on, close the hood, and start the engine to ensure everything is operating smoothly.
Valvoline's advanced synthetic transmission fluid, called maxlife nextgen, is compatible with the 2000 Ford F150.
Mercon 5 should not be confused with Dexron III or regular Mercon. It is important to avoid using a different type or risking potential problems if you are uncertain.
According to the Haynes Repair manual, only MERCON automatic transmission fluid should be used. I have a 2000 Ford F-150 (XL 4.6L V8 5 Speed) and could not find MERCON ATF, so I purchased Valvoline Max Life Mercon V fully synthetic universal ATF fluid instead. It seems Ford now recommends using Mercon V, so I trust they have good reason for the change, though sometimes it's hard to keep up with the latest advice.