always use synthetic if possible
The 2013 Volvo S80 runs on regular unleaded.
The 2014 Volvo S80 runs on regular unleaded.
The 2011 Volvo S80 runs on regular unleaded.
The 2012 Volvo S80 runs on regular unleaded.
The 2015 Volvo S80 runs on regular unleaded.
The 2002 Volvo S80 runs on premium unleaded (required).
The 2008 Volvo S80 runs on premium unleaded (recommended).
The 2005 Volvo S80 runs on premium unleaded (required).
The 2010 Volvo S80 runs on premium unleaded (recommended).
The 2001 Volvo S80 runs on premium unleaded (required).
The 2007 Volvo S80 runs on premium unleaded (required).