remove radio from a grand marquis 2003
No.
take it to a shop
According to the 1996 Mercury Grand Marquis Owner Guide ( 5W-30 is the PREFERRED engine oil )
buy a new key at the dealer for about $27.
According to the 1996 Mercury Grand Marquis owners manual ( 5W-30 engine oil ) is the PREFERRED oil weight
According to the 2004 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6 quarts )
take it to the dealer
Take it to Best Buy
5
Let the handy man at it,
For a 1999 Mercury Grand Marquis : ( the engine air filter is Motorcraft FA-1668 )