Gear Oils

LubeCon offers a comprehensive range of Castrol gear oils to address varying needs and applications.

These Include:

  • Mineral-based gear oils, are derived from highly refined base stocks and blended with a variety of additives such as corrosion inhibitors, anti-foam, anti-wear, and anti-scuff/extreme pressure compounds.
  • Synthetic gear oils are specially engineered to handle extreme conditions with enhanced features such as thermal stability, high load carrying capacity, extreme pressure, high viscosity index, and wide temperature range.
  • Food grade gear oils, formulated from NSF International-approved lubricants

Gear Box Case Studies

Castrol products have routinely demonstrated improved surface performance in the field by arresting progressive wear problems in difficult, highly loaded gearbox conditions. Optigear 1100/460 stopped rapid micro-pitting wear of a dragline swing gearbox with severe load conditions and water contamination for a surface mining customer. In another case study, Optigear BM 460 extended the life of a gearbox that was expected to fail in six months (based on heavy wear and past history of failures) by over eight years for a major tire manufacturer.

Gear Oils Selection Chart

PRODUCT NAMEISO VGs AvailableBase OilAdditives1Viscosity IndexZincFlash Point Range2Pour Point Range2SpurBevelHelicalWorm


Alpha SP68 - 680MineralEP> 95N420°F - 445°F-6°F to +21°F

Molub-Alloy GM 90, 690, 300S, 1500

220, 320, 1000, 1500

MineralEP / Solids95 - 102N441°F - 482°F0°F to 21°F✓✓✓✓✓✓
Molub-Alloy GM 170W680 (AGMA 8C)MineralCompounding / Solids97Y471°F16°F✓✓
Molub-Alloy GM 969320MineralEP / Solids / Thickener100N445°F5°F✓✓✓✓✓✓
Optigear 110068 - 1500MineralEP / TGOA95-100Y457°F - 500°F-27°F to 5°F✓✓✓✓✓✓✓✓✓C
Optigear BM

68 - 1000, 3000

MineralEP / MFT90-110Y428°F - 482°F-11°F to 32°F✓✓✓✓✓✓✓✓✓C


Alphasyn EP150 - 680PAOEP149 - 167N428°F - 464°F-54°F to -27°F✓✓✓✓✓✓C
Alphasyn T150 - 460PAOAW131 - 141N520°F - 545°F-44°F to -22°F✓✓✓✓✓✓✓✓
Optigear RMO150PAOEP / MFT133Y374°F-54°F✓✓✓✓✓✓✓✓✓
Optigear Synthetic 800

150 - 1000, 2200

Polyglycol (PAG)EP210-320N520°F - 554°F-33°F to 7°F✓✓✓✓✓✓✓✓✓✓✓✓
Optigear Synthetic CT320PAOEP174-180N>482°F-49°F✓✓✓✓✓✓✓✓✓
Optigear Synthetic RO 150150PAOEP / MFT130Y410°F-49°F✓✓✓✓✓✓✓✓✓
Optigear Synthetic X220 - 460PAOEP151 - 179N> 482°F-49°F to -17°F✓✓✓✓✓✓✓✓✓

Food Grade

Optileb GT

220, 460

PAOEP151-157N410°F - 480°F-38°F to -33°F✓✓✓✓✓✓

1 EP = Extreme Pressure/Anti-Scuff AW = Anti-wear
1 TGOA = Tribol Gear Oil Additive, a proprietary blend of EP additives capable of improving gear condition.
1 MFT = MicroFlux Trans, a proprietary blend of EP additives capable of improving gear condition.
2 Varies by viscosity grade
3 Increasing performance from 1 to 3 checks. C = Consult Castrol Representative prior to use