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 )
5
4.5 quarts with oil
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 )
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 )
( 6 quarts with engine oil filter change ) according to the 2003 Mercury Grand Marquis Owner Guide
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 )
That would be the 4.6 liter engine, which takes six quarts. * of 5W-20 according to the 2003 Mercury Mountaineer Owner Guide
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 )
1994 - 12.25 qts.See "Related Questions" below about transmission fluid capacity
your mom is mercury
According to the 2001 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 )