4.6 engine requires 6 quarts to fill.
5w-20
The 2006 Mercury Grand Marquis owners manual shows : The use of synthetic or synthetic blend motor oil is not mandatory - the oil just has to meet Ford specifications
According to the 2006 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts / 5.7 litres of 5W-20 engine oil )
( 6 quarts ) with engine oil filter change , according to the 2006 Mercury Grand Marquis Owner Guide
According to the 2006 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts of 5W-20 engine oil )
( 6 quarts with engine oil filter change ) according to the 2003 Mercury Grand Marquis Owner Guide
when i do my oil change i put 6
According to the 2004 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts of 5W-20 )
5
Five with filter change
According to the 1996 Mercury Grand Marquis Owner Guide : With engine oil filter change : *( 5 quarts ) * engine oil dipstick is used to determine the fill amount
take it to a good mechanic or a ford or merc dealer and they have to clear it for you