Shell Tellus S2 MX 68 is a mineral based lubricant that is used in Hydraulic Systems. Tellus is a line of Shell Lubricants that covers a variety of hydraulic applications. The "S2" series is a group of mineral based hydraulic fluids with the MX representing premium oil with Anti-Wear (AW) additives. 68 represents the thickness of the oil which is an International Standards Organization Viscosity Grade (ISO VG) 68.
The Shell Tellus line has gone through many name changes over the years. The Tellus S2 MX line replaces Tellus S2 M and Tellus Premium lines.