So you have a 2013 S60 T6 r design? With the 3.0 engine
Volvo schedule is as follows
Air filter every 60,000km
Brake fluid every 2 years
Spark plugs every 120,000km
Aux belt, tensioner and idler pulley every 10years
Rubber coupling for alternator every 15yrs
Pollen filter every 15,000km
Transmission oil every 60,000km
(if used for towing or as taxi) or if you want your gearbox to survive