Before long, 300-horsepower Volvos became more common thanks to a new straight-six engine lineup that arrived for the 2011 model year. Below, we look back at the last of the straight-six Volvo models, and what you'd pay for one today. 2012 Volvo S60 R Design VolvoThe XC90 launched in 2002, using a drivetrain configuration familiar from the S80. Related A 90-Year-Old Supercar Straight-Six Engine Is Back In Production We can trace this straight-six love affair back to 1936. Other Premium Sedans From This Era To Consider2011 Volvo S60 VolvoThe Volvo S60 with the turbocharged T6 engine is a joy to drive, especially in the snow.