The 2004 Oldsmobile Silhouette is available as a 4-door, 7-seat passenger van. Starting at $28,465, the 2004 Oldsmobile Silhouette GL FWD is powered by a 3.4L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 26-mpg on the highway. The top of the line 2004OldsmobileSilhouettePremiere AWD , priced at $ 36,795 , is powered by a 3.4L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 24-mpg on the highway.