The Owner Guide for the 1999 Mercury Cougar shows ( 5.8 quarts with filter change )
for the 2.5 liter V6 engine
If it is a V6 about 6 Quarts with a new oil filter.
I pretty sure your looking at 5 with the filter.
Recommended amount is 5 and half quarts of 5W20
It takes 6 quarts of oil.
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4.6 Quarts of oil!
6 quarts of oil.
4.2 quarts of oil
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