Either the 3.0 liter Vulcan V6 or the 3.0 liter Duratec V6 which is a DOHC
According to the 1999 Mercury Sable Owner Guide : For the 3.0 litre " Vulcan " V6 engine and the 3.0 litre " Duratec " V6 engine : ( " regular " unleaded gasoline , 87 octane )
According to the 1999 Mercury Sable Owner Guide : ( 5W-30 )
According to the 1999 Mercury Sable Owner Guide : ( Motorcraft MERCON-V automatic transmission fluid ) ( to confirm the type used , it should be engraved in the automatic transmission fluid dipstick )
According to the 1999 Mercury Sable Owner Guide : It came from the factory with a 50 / 50 mix of distilled water and GREEN color antifreeze ( meeting Ford specification ESE-M97B44-A )
5W-30 is the preferred engine oil , according to the Owner Guide
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.
3.0 liter " Vulcan " V6 engine : Motorcraft BXT-58R or optional Motorcraft BXT-36R ====================================== 3.0 liter DOHC " Duratec " engine : Motorcraft BXT-36R ======================================= On a 2000 Mercury Sable
In a 1994 Mercury Sable : " regular " unleaded gasoline , 87 octane
R134a
Use exactly what the manufacture recommends. 5w30 should be the recommendation.
According to the 2003 Mercury Sable Owner Guide ( 5W-20 ) With engine oil filter change : The 3.0 litre " Vulcan " V6 engine takes ( 4.5 U.S. quarts of 5W-20 engine oil ) The 3.0 litre " Duratec " V6 engine takes ( 5.5 U.S. quarts of 5W-20 engine oil )
SAE 5w20