Circulating oils having a performance additive package and related methods

A method for producing a circulating oil composition, the method comprising:

• providing a base oil for a circulating oil composition, the base oil comprising a Group II/II+extra heavy neutral oil base stock and a Group V oil base stock;
• providing a performance additive package;
• and
• blending the base oil with the performance additive package, thereby forming a circulating oil composition wherein:
• the Group II/II+extra heavy neutral oil base stock is present in the circulating oil composition at from about 5 wt % to about 94 wt %;
• the Group V oil base stock is present in the circulating oil composition at from about 5 wt % to about 40 wt %;
• and,
• the performance additive package is present in the circulating oil composition at from about 1 wt % to about 5 wt %;
• wherein the circulating oil compositions exhibits, as compared to a corresponding circulating oil composition wherein 100% of the Group II/II+extra heavy neutral oil base stock is replaced by a Group IV oil base stock, a property selected from the group consisting of:
• (i) equivalent or reduced copper corrosion, as determined by ASTM D130;
• (ii) equivalent or reduced rust formation, as determined by ASTM D665;
• (ii) equivalent or reduced pour point, as determined by ASTM D97;
• (iv) equivalent or increased demulsibility, as determined by ASTM D1401 or ASTM D2711;
• (v) equivalent or decreased foaming, as determined by ASTM D892 or AMS1393MOD-4/LUB;
• (vi) equivalent or reduced oxidation, as determined by ExxonMobil B10 oxidation test;
• and
• (vii) any combination of (i)-(vi).