Before you switch check the current P & Zn levels of Mobil 1. Typically now only the racing oils have the higher amounts recommended for our older flat tappet cams.
Amsoil is full synthetic and they have a formula that has high Zn & P. Also check into shipping as Amsoil direct shipping is pretty cheap , I pay $9 a case shipping. If you join their preferred member club for $20/yr you also get reduced pricing.
Julian
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