The correct oil weight is now 5W20; it used to be 5W30, but Ford has recently allowed your engine to use 5W20 as an energy saving oil. If you don't use synthetic oil, stick with the 5W30; non-synthetic 5W20 will burn out your engine faster than non-synthetic 5W30.
0.054 for 1999 to 2001 V6.
how do you remove the headliner from a 1999 mercury cougar
No.
Yes , the 1999 Mercury Cougar is FRONT wheel drive
It's a bit buried. Note that the 1999 Mercury Cougar has no user-servicable barts.
relay R1 is for the fuel pump on a 1999 Mercury Cougar
According to the 1999 Mercury Cougar Owner Guide : ( 58.5 litres / 15.4 U.S. gallons )
The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column
I was looking at the 1999 Mercury Cougar Owner Guide and it does not show that it has a gas cap warning light
According to the 1999 Mercury Cougar Owner Guide the six disc CD changer ( if equipped ) is located in the luggage compartment
The engine diagram for a 1999 Mercury Cougar is used in diagnosing and repairing problems. It gives the location of each component and its connection type.
Ebay, http://www.nextag.com/mercury-cougar-headlights/search-html, or just drive to your ford/mercury dealer.