Q5 Oil There are a lot of factors to consider when you are thinking about the oil capacity of your 2010 Audi Q5 engine. This includes the cost of an oil change, how reliable the engine is, and what the viscosity grade of the engine oil is. Keeping good records of these things will help you to stay informed about the health of your engine, and will allow you to make an educated decision on when it is time to have the engine oil changed.