Gulf Gear Oil ST is high quality mild anti-wear type gear oil suitable for use in automotive transmissions of the non-automatic type and in some spiral bevel and worn gear differentials where extreme pressure characteristics are not required. Gulf Gear oil ST is available in SAE 90 and 140 viscosity grades. They are manufactured from parafﬁnic type base oil and have high viscosity indices for gear oils of this type. They are stable in service and contain an anti-foam agent to prevent foaming in gear cases even under severe load, speed and temperature conditions. They will not oxidize excessively in normal sen/ice.
Gulf Gear Oil ST 90 is generally recommended for winter use, particularly in extremely low temperature operations. It will minimize winter gear changing difficulties in synchronous and bevel gear transmissions. Gulf Gear Oil ST 90 may also be used in many transmissions and in some rear axles during summer operation. Consult manufacturer’s recommendations for the proper grade.
Gulf Gear Oil ST 140 is recommended for summer use where a heavier oil is desired such as in truck and heavy duty transmissions an in real Axles of trucks and tractor ﬁnal drives where the manufacturer recommends this grade of straight mineral oil. Gulf Gear Oil ST 140 is supplied for use where mild anti-wear mineral gear oil is desired or required. Our preferred recommendation for most automotive applications, however, MP gear oil in the appropriate viscosity grade.