The 2008 BMW 5-Series's chief competitor, the E-Class, has more of an emphasis on comfort than the 5, with a roomier-feeling interior and a softer ride.
The A6 also feels a bit more spacious and comfort-oriented, but its performance--especially from the available 4.2-liter V-8--doesn't come close to matching that of the 550i's 4.8-liter V-8.
None of the competition offers a manual transmission either.
The Cadillac STS brings plenty of high-tech options and respectable performance, but it doesn't have the prestige of the 5-Series.
There's also the Infiniti M35 and M45, which bring brisk performance and some rival high-tech features such as a lane-departure system, but their cabins aren't as quiet and refined as those of the 5-Series models.
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|2008 BMW 5-SeriesBrowse Used Listings||2009 Cadillac STSBrowse Used Listings||2008 Audi A6Browse Used Listings||2008 Mercedes-Benz E ClassBrowse Used Listings|
|11 MPG City / 27 MPG Hwy||15 MPG City / 26 MPG Hwy||16 MPG City / 27 MPG Hwy||12 MPG City / 32 MPG Hwy|
|Gas I6||Gas V6||Gas V6||Gas V6|
|4-Door Sedan 528i RWD||4-Door Sedan V6 RWD w/1SC||4-Door Sedan 3.2L FrontTrak||4-Door Sedan Sport 3.5L RWD|
|Rear Wheel Drive||Rear Wheel Drive||Front Wheel Drive||Rear Wheel Drive|
|4 Door Sedan||4 Door Sedan||4 Door Sedan||4 Door Sedan|
|Manual||Automatic||Automatic CVT||Automatic w/OD|