Gear oil synthetic

Match gear oil synthetic to your transmission type and OEM spec, then pick a viscosity and brand that meet that spec. For manual gear systems, look for full-synthetic options that meet GL-4/GL-5 ratings; for automatics, use a synthetic ATF that matches your transmission's requirements. In our range you’ll find trusted brands like Castrol EDGE, Mobil 1, Motorcraft, Mannol, Supertech, and Hardex, covering common transmissions. Also consider climate and driving style to pick a thinner grade for cold starts or a thicker grade for towing.

Viscosity grade tells you how thick the oil is at cold and hot operating temperatures, guiding protection and shifting feel. 75W-90 is a common gear oil grade for manual transmissions and hypoid gears, offering strong film strength for everyday use. 5W-30 is typically an engine oil grade; if a gear oil spec calls for a 5W-30-equivalent, only use it when the OEM specifies that grade for that transmission. Always choose the grade that matches the OEM spec and climate—lighter grades help cold starts, thicker grades protect in hot or heavy-load conditions.

For light daily driving, a standard full-synthetic gear oil often provides smooth operation and good protection. For heavy towing or off-road use, choose a higher-film-strength option such as 75W-90 full synthetic gears to withstand load and heat. In our range you’ll find reputable options from Castrol EDGE, Mobil 1, and Motorcraft that fit these scenarios. Avoid mixing oils and always confirm the grade matches your transmission’s spec.

Always use a gear oil synthetic that matches the transmission manufacturer’s specification and your climate. Keep seals and rubbers compatible with synthetic oils, and avoid mixing different oil types. Follow proper drain-and-fill procedures and don’t exceed the recommended capacity. Check level after a short drive and re-check when cold.

Castrol EDGE, Mobil 1, and Motorcraft are among the most trusted gear oil synthetic brands in our range. Mannol and Supertech offer reliable full-synthetic options, while Hardex provides budget-friendly choices. Look for products labeled gear oil synthetic with the appropriate viscosity grade for your transmission and climate. Brands with strong track records like these help ensure consistent protection across common transmissions.

No—gear oil synthetic is formulated for manual transmissions and specific gear-set bearings, while ATF is designed for automatic transmissions. Use gear oil synthetic where your vehicle requires a gear oil specification and ATF only where advised by the OEM. Do not mix gear oil and ATF, as their additive chemistry and viscosities differ. If in doubt, consult your vehicle manual or choose a product clearly labeled for gear oil synthetic in our range.