All SHC 600 Series grades are fully synthetic PAO — select by viscosity grade specified in your gearbox OEM manual

Extended Drain Intervals

RPVOT 2,500 minutes and TOST 10,000+ hours — outstanding oxidation and thermal stability. Particularly effective in remotely located gearboxes where oil change-out is difficult, filled-for-life drives and applications where the maintenance cost of oil changes is high.

FZG Stage 13+ & EP Protection

FZG scuffing Stage 13+ and FE8 roller wear of 2 mg — outstanding protection against gear scuffing and bearing wear under the high contact loads typical of slow-speed, high-ratio gearboxes. Protects gear tooth flanks and bearing surfaces under sustained maximum torque.

High Viscosity Index — 174

VI 174 maintains more stable viscosity across the operating temperature range — ensuring adequate film thickness at elevated gearbox sump temperatures in South African high-ambient-temperature mining environments, while providing reliable cold-start lubrication at low overnight temperatures.

Energy Efficiency

Low traction coefficient of the PAO base stock reduces fluid friction in gear contacts and rolling element bearing load zones — up to 3.6% energy efficiency improvement versus mineral equivalents in controlled worm gearbox testing. Meaningful savings in high-ratio, continuous-operation gearboxes.

Shear Stability

Virtually no viscosity loss under mechanical shear in heavily loaded gear and bearing applications — maintaining the ISO VG 460 film thickness throughout the extended drain interval, without the viscosity breakdown that causes increased wear in mineral oils operating beyond their designed drain interval.

Seal Compatibility

Generally compatible with most NBR, FKM and other elastomeric seal materials used with mineral oils — however, substantial variations in elastomer response are possible. Before converting a system to Mobil SHC 634, consult your equipment supplier or seal manufacturer to verify compatibility with specific seal materials in service.

Slow-Speed High-Load Gearboxes

High-ratio Flender and SEW gearboxes on conveyors, agitators and processing plant drives where ISO VG 460 is OEM-specified · Worm gearboxes where maximum film thickness and energy efficiency are both required · Any enclosed gearbox with OEM viscosity specification of ISO 460

Mining & Processing Plants

Processing plant conveyor head drives running continuous shifts · Crusher and screen drives · Agitator and mixer drives specifying ISO 460 · Northern Cape mining equipment where high ambient temperatures push sump temperatures beyond mineral oil limits in summer conditions

Extended Drain Applications

Any ISO VG 460 gearbox where the target is to extend drain intervals beyond what mineral gear oil can support — particularly inaccessible or elevated gearboxes, filled-for-life drives and equipment where each oil change requires production shutdown

High-Load Bearing Applications

Mixer roll bearings and roll neck bearings under high temperature · Severe centrifuge applications including marine centrifuges · Plastic calenders · Any bearing application where ISO VG 460 is specified and extended service life and reduced maintenance are the target

Flender (Siemens AG)

Direct OEM approval — among the most widely installed gearbox brands in South African mining and processing plants

SEW-Eurodrive

Direct OEM approval — widely installed conveyor, mixer and processing plant gearbox brand across South African industry

AGMA 9005-F16

Primary North American gear oil standard referenced by most international gearbox OEMs

DIN 51517-3:2018-09

CLP 460 classification — required by German gearbox OEMs including Flender, SEW and Nord

ISO 12925-1:2024 — ISO L-CKD

International enclosed gear lubricant classification for extreme pressure lubricants

NUPIC (Nuclear)

US blended product audited and compliant under NUPIC Commercial Grade Vendor Program