Mercedes CLS Specs, Engines & Dimensions (2004–2008) — First Generation
The first-generation Mercedes CLS is a four-door Fastback that wears coupe proportions with everyday access. You get a low, sweeping silhouette and four proper doors rather than a two-door layout.
A Mercedes CLS engine in this Fastback generation is a 3.5-litre petrol or 3.0-litre diesel, both with an automatic and rear-wheel drivetrain. The CLS350 3.5 AT and CLS350CGI 3.5 AT cover petrol; the CLS320CDI 3.0 AT is the diesel example. These powertrains are selected, not exhaustive.
Mercedes CLS trim levels describe equipment attached to a named technical version. The CLS350 3.5 AT Fastback is a petrol automatic with rear-wheel drive, and its listed equipment configurations are both called 350. That 350 name groups cabin and convenience choices; it does not mark a different engine or gearbox.