Specialty Oils

Transformer Oil

Gear Oil GP

Phillips 66® Transformer Oil is a highly refined electrical insulating oil developed for use in oil-immersed transformers, capacitors, tap changers, and circuit breakers where the equipment manufacturer specifi es a Type II inhibited oil meeting ANSI/ASTM D3487-09 requirements.

Transformer Oil


• Excellent insulating properties

• High dielectric strength

• Low power factor

• Resists oxidation and deposit formation

• Excellent low-temperature properties

• Compatible with materials used in transformers

• Does not contain any PCBs


• Oil-immersed transformers

• Circuit breakers & switches

• Fuses

• Tap changers

• Other oil-immersed electrical equipment