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In the 2015 Toyota Prius, all trim levels come equipped with a 1.8L 4-cylinder engine. This model specifically requires 4.4 quarts of SAE 0W-20 synthetic motor oil. While using SAE 5W-20 as a substitute is possible, it is not recommended due to differences in oil viscosity. Opting for higher viscosity oils can increase friction within the engine, potentially causing premature damage. It is advisable to stick to the manufacturer's specifications for oil type and weight, even if it means spending a bit more on an oil change.
The regular 2015 Toyota Prius uses a 0W-20 oil. The 2015 Toyota Prius C, Prius Plug-In, and Prius V models also require 0W-20 oil.