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The Audi Q5 3.0 TDI's premium plus diesel engine mandates the use of SAE 5W-30 full synthetic oil. In a pinch, you can go with SAE 5W-40, even conventional, for a temporary fix, but it's not ideal for long-term use due to its poorer viscosity. The numbers in an oil's name represent its viscosity - the first number is for startup temperature and the second for operating temperature. For example, 5W-40 signifies a viscosity of 5 at start and 40 at peak operation, while 5W-30 indicates 5 and 30 respectively. Lower numbers are better, and using a higher quality viscosity will enhance engine performance and durability. Hence, it is crucial to stick with the manufacturer's recommendation for oil, even if it means a slightly higher cost. For this engine, that would be SAE 5W-30 synthetic oil.
The type of oil needed for the 2016 Audi Q5 depends on the fuel variant. For the 2.0 T Premium and 3.0 T Premium gasoline engines, it is advised to use synthetic oil with a viscosity of SAE 5W-40. When it comes to the 3.0 TDI Premium Plus diesel engine, synthetic oil is also suitable, with model number 507 and viscosity grade 5W-30.