Keep in mind there are different Castrol quarts for different Castrol products depending on where you buy it. For example, O’Reilly has the more squareish bottles with smaller opening for quarts of white bottle GTX and green bottle GTX High Mileage while Edge at O’Reilly has the “regular” shape oil bottles with bigger opening. On the other hand Walmart uses the “regular” shape bottles with bigger opening for GTX, GTX High Mileage, and edge. Except they have the squareish small opening bottles for GTX synthetic?