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Can you use 10W40 motor oil in a 1997 Volvo 850?

It is generally not recommended to use 10W40 motor oil in a 1997 Volvo 850. The recommended motor oil for this vehicle is 5W30. Using an oil with a higher viscosity than recommended can cause increased engine wear, reduced fuel efficiency, and decreased engine performance. In cold climates, using a higher viscosity oil can make it more difficult for the engine to start. Therefore, it is best to use the oil specified in the owner's manual for your vehicle.