There is a square room. On each side of the room is a FREE (12 quarts) case of motor oil. You can only choose 1 Free case to take home with you. Which do you choose? Remember, it's free. Side 1. Pennzoil Yellow Bottle of any grade. Side 2. Mobil 1 Extended Performance of any grade Side 3. Castrol GC...known as German Castrol Side 4. Pennzoil Platinum of any grade.