That is Wet/Winter mode. During very wet or icy conditions you can use this so you don't spin your tires all the time. The W makes the transmission start in 3rd gear. This puts less torque to the wheels. You may have noticed once or twice when its wet out and you are trying to get going the wheels will spin freely. That's because the car has too much torque for certain conditions.
The 2010 Volvo C70 has 20 valves.
The 2004 Volvo C70 has 20 valves.
The 2009 Volvo C70 has 20 valves.
The 2001 Volvo C70 has 20 valves.
The 2013 Volvo C70 has 20 valves.
The 2002 Volvo C70 has 20 valves.
The 2006 Volvo C70 has 20 valves.
The 2003 Volvo C70 has 20 valves.
The 2011 Volvo C70 has 20 valves.
The 2012 Volvo C70 has 20 valves.
The 2007 Volvo C70 has 20 valves.
The 2004 Volvo C70 is a gas-powered vehicle.