4.6L V8 SEFI OHC. Lo-Lo-Miles! We buy low! Sell low! You win big! This superb 2005 Mercury Grand Marquis is the luxury car you've been longing to find. J.D. Power and Associates gave the 2005 Grand Marquis 5 out of 5 Power Circles for Overall Dependability. The early bird catches the worm. This Grand Marquis is fast enough to make sure you always get that worm.