Castrol Optigear Synthetic CT 320 NG
Castrol Optigear Synthetic CT 320 NG is Castrol’s latest synthetic polyalphaolefin (PAO) gear oil designed to perform in the most challenging of applications, especially those found in the wind industry. Its high viscosity index coupled with advanced gear oil additives make it an ideal lubricant for gear boxes where large changes in temperature and humidity can not be controlled.
Strong thermal and oxidative stability allows Castrol Optigear Synthetic CT 320 NG to resist breakdown at elevated operating temperatures, helping the product retain its protective properties under demanding duty cycles.
Strong corrosion protection helps preserve metal surfaces against rust and chemical attack, supporting equipment longevity in environments where moisture or aggressive contaminants may be present.
Castrol Optigear Synthetic CT 320 NG maintains a stable viscosity profile throughout its service life, resisting shear-induced thinning so that critical lubrication clearances remain consistently protected.
Castrol Optigear Synthetic CT 320 NG has been formulated specifically for use in wind turbine gear box applications but it can be used for all types of enclosed gears – including heavy and shock-loaded gears and bearings where EP properties are required. It is suitable for use in gear boxes where micro-pitting resistance is required and for a wide range of applications in extreme environments including mining and quarrying, marine applications, and paper production. Castrol Optigear Synthetic CT 320 NG is fully compatible with nitrile, silicone and fluoropolymer seal materials.
Castrol Optigear Synthetic CT 320 NG is manufactured to Castrol’s standard tolerances; users should consult the safety data sheet for handling, storage and disposal guidance.


