Shell Diala ZX-I is the new electrical insulating oil from shell designed to meet the challenges presented by the latest power transformers.It Offers an extended oil life with teh peace of mind of zero sulphur content. Shell Diala is manufactured from zero sulphur base oils produced using shell's GTL (gas to liquid) technology.These base oils offer a high degree of compositional consistancy and have an excellent response to anti-oxidant. In Shell Diala S4 ZX-I metts both the established and new industry copper corrosion tests.