Collection: Gear oils

Transmission oils – for manual gearboxes, automatics and DCT transmissions

Transmission oil lubricates and protects gearbox components and other transmissions. This category includes conventional gear oils, selected ATF fluids and products for dual-clutch transmissions. An incorrect fluid may impair shifting and component durability; meeting the gearbox manufacturer's specification is essential.

How is 75W-90 different from ATF?

Grades such as 75W-90 refer to transmission oil viscosity under SAE J306. ATF describes a family of fluids for certain automatic transmissions and other systems requiring such fluids. Not all ATF products are interchangeable, and a fluid for one automatic gearbox is not necessarily suitable for a DCT or CVT.

Are API GL-4 and GL-5 interchangeable?

API GL grades specify certain gear oil performance requirements, but GL-5 is not automatically an appropriate replacement for GL-4. Synchroniser design, materials and gear loading all matter. Where an OEM specification is required, use it as the primary selection criterion.

How to choose gearbox oil

• Identify the transmission type and designation.
• Check the manufacturer's required specification and viscosity.
• Verify the required quantity and replacement procedure.
• Compare the exact product part number.

The range includes selected Castrol and K2 oils. Automatic and DCT transmissions may require particularly careful compatibility checks.