In short, the Volvo T5 engine allows you to be more flexible with FWD & AWD options as final drives. Either configuration is mated to the Volvo Geartronic eight-speed automatic transmission. The Volvo T6 engine also uses the same transmission but is permanently fixed to an AWD configuration. Let us take this one step further. A lot of our customers use the word "trim" and "engine" interchangeably. In this case, thinking about the Volvo T5 vs. T6 as trims isn't necessarily the way to go. The actual trims available from Volvo Cars are the Momentum, R-Design, & Inscription, while the badging of T4, T5, T6, etc., refer to engine designation within model trims.