Volvo recommends:
If the engine oil cannot be checked on a regular basis and the level falls too low, there is a risk that this will cause serious damage to the engine.
Important
In order to fulfil the requirements for the engine's service intervals all engines are filled with a specially adapted synthetic engine oil at the factory. The choice of oil has been made very carefully with regard to service life, starting characteristics, fuel consumption and environmental impact.
An approved engine oil must be used in order that the recommended service intervals can be applied. Only use a prescribed grade of oil for both filling and oil change, otherwise there is a risk of the service life, starting characteristics, fuel consumption and environmental impact of the car being affected.
If engine oil of the prescribed grade and viscosity is not used, engine related components may become damaged. Volvo Car Corporation disclaims any liability for any such damage.
Volvo recommends that oil changes are carried out at an authorised Volvo workshop.
Volvo uses different systems to warn about the oil level if it is too low/high, or in the event of low oil pressure. Certain engine variants have an oil pressure sensor, and then the driver display's warning symbol for low oil pressure 
is used. Other variants have an oil level sensor, when the driver is informed via the driver display's warning symbol 
and display texts. Certain variants have both systems. Contact a Volvo dealer for more information.
Change the engine oil and oil filter in accordance with the intervals specified in the Service and Warranty Booklet. Using oil of a higher than specified grade is permitted. If the car is driven in adverse conditions, Volvo recommends using an oil of a higher grade than the one specified.