The 2018 Subaru Impreza comes only with a 2.0 liter, 4 cylinder engine throughout all of its trims, the base, Limited, Premium and the Sport. They all hold 4.6 quarts of oil.
Viscosity: 5W-30 (All TEMPS) SAE 5W-30 Synthetic oil is required. If SAE 5W-30 Synthetic oil is not available, SAE 5W-40 conventional oil may be used. However, it must be replaced with SAE 5W-30 Synthetic oil at the next oil change.
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Capacity: 4.5 quarts (with filter)After refill check oil level.