Mine uses 7 and its a 96. Ive replaced the dipstick but it may be cause of my oil cooler on the oil filter housing. On a safe bet id use 6 on yours. Manual tended to under lube ours. Plus rule of thumb 4 cyl 4 qt 6 cyl 5 qt and 8cyl 6 qts. Old mechanic rule lol. Usually dead on depending on of course oil pan depth and width or design.
1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.