red transmission oil. no need for iso 40 hydraulic oil, red is light weight and that's the trick. simple,,getting to the resovoir is another story,usally throught the rear side panel or if your luckey, the trunk rear cover below the rear window....either way you need to buy a tool for the correct way to remove the panels.
red
According to the 2000 Ford Mustang Owner Guide : ( Motorcraft MERCON automatic transmission fluid is used for the convertible top )
The convertible top motor uses automatic transmission fluid.The convertible top motor uses automatic transmission fluid.
You can add hydraulic fluid to Porsche convertible top motor by popping open your engine hood and then pouring the hydraulic fluid into the appropriate compartment.
Automatic transmission fluid.
MB hydraulic fluid
HSHC Fluid
According to the 2003 Ford Mustang Owner Guide : ( Motorcraft MERCON automatic transmission fluid is used for the convertible top )
dexon 3
Febi-Bilstein P/N 02615
it should be behind the back seat ...
power steering fluid