Sounds like a leak. if you leave it in one place (on and or off) for a period of time, are you noticing any oil dripping onto the ground? Check your pan plug, it may be lose, or you may have a bad hose somewhere. if the oil isn't ont he ground, it may be draining into the enguine somewhere. Most places can look into this for fairly short money.
According to the 2008 Mercury Sable Owner Guide : For the 3.5 litre V6 engine : With engine oil filter change : ( 5.5 U.S. quarts of 5W-20 engine oil )
According to the 1998 Mercury Sable Owner Guide : With engine oil filter change : The 3.0 liter " Vulcan " V6 engine takes ( 4.5 quarts ) The 3.0 liter " Duratec " V6 engine takes ( 5.5 quarts )
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mercury sable
According to the 1999 Mercury Sable Owner Guide : With engine oil filter change : The 3.0 liter Duratec ( DOHC ) V6 engine takes : ( 5.5 U.S. quarts of 5W-30 )
According to the 1999 Mercury Sable Owner Guide : For the 3.0 litre , DOHC , " Duratec " V6 engine : With engine oil filter change : ( 5.5 U.S. quarts of 5W-30 engine oil )
For the 1998 Mercury Sable : With engine oil filter change : The 3.0 liter " Vulcan " V6 takes 4.25 liters ( 4.5 U.S. quarts ) The 3.0 liter " Duratec " V6 takes 5.2 liters ( 5.5 U.S. quarts )
According to the 2002 Mercury Sable Owner Guide : With engine oil filter change : The 3.0 liter " Vulcan " V6 engine takes ( 4.5 U.S. quarts of 5W-20 ) The 3.0 liter " Duratec " V6 engine takes ( 5.5 U.S. quarts of 5W-20 )
According to the 1997 Mercury Sable Owner Guide : With engine oil filter change : ( the 3.0 litre " Vulcan " V6 engine takes 4.5 U.S. quarts of 5W-30 engine oil ) ( the 3.0 litre " Duratec " V6 engine takes 5.5 U.S. quarts of 5W-30 engine oil )
According to the 2003 Mercury Sable Owner Guide : With engine oil filter change : For the 3.0 litre " Vulcan " V6 engine ( 4.5 U.S. quarts of 5W-20 engine oil ) For the 3.0 litre " Duratec " V6 engine ( 5.5 U.S. quarts of 5W-20 engine oil )
According to the 2004 Mercury Sable Owner Guide : With engine oil filter change : For the 3.0 litre " Vulcan " V6 engine ( 4.5 U.S. quarts of 5W-20 engine oil ) For the 3.0 litre " Duratec " V6 engine ( 6.0 U.S. quarts of 5W-20 engine oil )
The Mercury Sable transmission has a fluid capacity of 12 quarts. You can use any SAE certified automatic transmission fluid.