The “0” refers to the oil’s viscosity or thickness when the engine is cold, while the “20” refers to its viscosity at engine operating temperatures.
Acura recommends opting for Genuine Acura Motor Oil as a first pick, but you can consider other brands, too—what’s most important is that it has an American Petroleum Institute (API) certification seal and the correct viscosity grade.
Synthetic oil is okay to use, too, as long as it has an API certification seal on the label and the required viscosity grade. For more oil type specifications for your 2017 Acura MDX, you can refer to your owner’s manual.