iam currently running rotela 15/40 in my boat it has a good amount of zinc in it, but i also run valvoline vr1 10/30 in my drag car, its a very good oil hands down,
I am biased because I am employed by Ashland Oil, the parent company of Valvoline........but yes, great oil What ever brand you choose, choose an off road oil that has not been molested by the demands of today's automobiles.