That's it. A little extra peace of mind with the ever declining amount of zinc in oil. But also within reason, as too much of a good thing can lead to combustion and exhaust deposits. But I'm pretty archaic with oil selection, preferring Rotella T1 SAE 30 and liberal warm up time. But I'll be running SAE 30W VR-1 with minimal additives after going with a solid flat tappet.