The transmission on the s60 has no serviceable filter. What is recommended is to flush the Transmission Fluid using a good grade synthetic fluid such as Castrol Syngard.
IPD
The 2002 Volvo S60 has a 5-speed manual.
The 2007 Volvo S60 has a 5-speed automatic.
The 2004 Volvo S60 has a 5-speed manual.
The 2006 Volvo S60 has a 5-speed automatic.
The 2005 Volvo S60 has a 5-speed manual.
The 2008 Volvo S60 has a 5-speed automatic.
The 2001 Volvo S60 has a 5-speed manual.
The 2011 Volvo S60 has a 6-speed shiftable automatic.
The 2014 Volvo S60 has a 6-speed shiftable automatic.
The 2015 Volvo S60 has a 8-speed shiftable automatic.
The 2012 Volvo S60 has a 6-speed shiftable automatic.