
The 159 is available in both front and four-wheel drive, configurations. The "Q4" four-wheel drive system utilises a Torsen type C twin differential (front and center differential in the same unit) and is available on the 3.2 litre petrol and 2.4 litre diesel engines. The gearbox is a six-speed manual on most models (1.8 has a five-speed), and a six-speed automatic Q-Tronic gearbox (Aisin AW TF-80SC) is available for the 1.9 diesel, 2.4 diesel and 3.2 petrol models. The Selespeed gearbox is for sale in some countries with the 2.2 petrol engine.
Several levels of trim are available, depending on market. Four trim levels: Progression, Distinctive, Exclusive and Turismo Internazionale (TI). In the UK there are three levels of trim: Turismo, Lusso and Turismo Internazionale (TI). Among other options, the 159 is also available with the Blue&Me infotainment system.
The torsional rigidity of the chassis is one of the best in this category, at 180.000 daNm/rad.[4]



