It honestly doesn't matter. Mazda oil isn't this incredible oil. The moly type differs too. There's trinuclear moly which can achieve what dinuclear moly can but at a fraction of the quantity and you'll never really know looking at a voa. But if you're inclined i guess valvoline extended protection. Though it's insignificant. If you want to protect your engine better just bump up a grade. What mazda is it exactly. What engine.