Good question! For the most part, the average cost for a quart of motor oil will fall somewhere between $3.50 and $6.00, depending on the brand, type of oil, and function. Some high-performance or high-mileage oils can even cost over $7.00 for a single quart.
As stated, there will be some price variation depending on the brand of oil, but it’s the oil’s function and the type of oil that really changes the cost: