Rural King has 5 quart jugs for &14.99. The only thing less expensive is their Provident conventional oil. I’m perfectly comfortable using it for a 3-4K change interval in my older vehicles, but what about my newer DI engines? I’m currently running NAPA full synthetic (Valvoline) in my Mazda6 and Nissan Titan but I don’t know if using this synthetic blend would be a good idea.