I'm going to do a complete drain and replacement of my 07 F150 5.4 FX4 power steering fluid. The manual says Motorcraft Mercon V ATF but for capacity, it just says "Fill to between Min/Max on res...." OK. But how much is that? How many quarts/ litres should I buy?

 

Mine was completely empty and took less than a quart. I'm going to have to find the l