No.
remove radio from a grand marquis 2003
take it to a shop
According to the 1996 Mercury Grand Marquis Owner Guide ( 5W-30 is the PREFERRED engine oil )
According to the 2004 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6 quarts )
According to the 1996 Mercury Grand Marquis owners manual ( 5W-30 engine oil ) is the PREFERRED oil weight
take it to the dealer
Take it to Best Buy
5
there is a spcial key required to remove them
Let the handy man at it,
For a 1999 Mercury Grand Marquis : ( the engine air filter is Motorcraft FA-1668 )
i had the same problem with mine and all it was is that i dident get the plug all the way in. The bad thing is you have to take the dash off again