At an anthracite coal open pit mine in remote Siberia, extreme weather conditions are common with temperatures reaching as low as -50°C. The mining customer invested in the modernisation of equipment, and purchased new Liebherr hydraulic mining excavators and mining crawler dozers. A temperature of -51°C was established as the critical temperature limit for the equipment service. The customer requested a hydraulic oil that could reliably perform down to this limiting value.

The regional ExxonMobil Lubrication Field Engineer recommended Mobil UnivisTM HVI 26, a premium performance anti-wear hydraulic oil with an unusually high viscosity index and very low pour point, “giving this product excellent viscosity control characteristics” and an ability to maintain excellent fluidity conditions at low temperatures. Its excellent rust and corrosion protection properties, combined with an equally effective oxidation resistance guarantee equipment protection and a long service life.

ExxonMobil, following the implementation of Mobil Univis HVI 26, no unscheduled downtime has been recorded, even when the surrounding temperatures reached -50°C. Furthermore the hydraulic oil retained its fluidity and its lubricating properties at critical temperature levels. Inspection of internal components of the hydraulic system confirmed absence of deposits or wear, “demonstrating the great cleaning and protective abilities of the oil.”