Do two things:
1. Measure your dipstick from the tip to the edge of the cap that slips over the dipstick tube. It should be 38" long (96.52cm). If it's longer, then it hasn't been shortened per the Ford TSB. Assuming it's still the stock dipstick and it hasn't been shortened, add 1 extra quart of oil above the full mark.
2. Look at your oil pan from under the car. Is it a stock front sump pan? If you have the stock pan, you should use 5 quarts of oil.
Or an aftermarket road race pan (which all Panteras should have) from Aviad or Armando? If you have one of these pans with the deep sump extending almost the entire length of the pan, you will need 9 quarts of oil.
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