The twin Solex carbs on carbureted cars are called problematic and are blamed for a less refined engine note; owners suggest Weber DGV or EFI conversions on drivers. The fuel-injected 220SE is described as noticeably smoother and quieter back-to-back, and its injection is a key reason SE cars are prized.
Solex carburetors versus fuel injection: the sound of the SE
Mercedes-Benz Ponton · mechanical