Your vehicle’s manual gearbox relies on high-quality oil to ensure smooth operation and a long service life. Choosing the correct gearbox oil is essential for maintaining performance and avoiding expensive repairs. With various types available, it can be challenging to know which one is best for your car. In this guide, we’ll explore the different types of manual gearbox oil and provide tips on selecting the right one for your vehicle.
Understanding Manual Gearbox Oil
Manual gearbox oil, also known as transmission oil or fluid, reduces friction between moving parts, prevents overheating, and protects against wear and tear. Unlike engine oil, gearbox oil is specifically designed to handle the unique demands of a transmission system.
Types of Manual Gearbox Oil
There are several types of manual gearbox oil, each suited for specific applications:
Mineral Gearbox Oil:
- Derived from refined crude oil, mineral-based oils are cost-effective and suitable for older vehicles.
- They offer adequate protection but may not perform well under extreme conditions.
Synthetic Gearbox Oil:
- Made from chemically engineered compounds, synthetic oils provide superior performance and durability.
- They’re ideal for modern vehicles and those subjected to heavy loads or extreme temperatures.
Semi-Synthetic Gearbox Oil:
- A blend of mineral and synthetic oils, semi-synthetic options balance affordability and performance.
- They’re suitable for a wide range of vehicles, offering enhanced protection compared to mineral oils.
API GL-Rated Oils:
- Gearbox oils are categorised by API GL ratings (e.g., GL-4, GL-5), indicating their suitability for different gear types and conditions.
- GL-4 oils are typically used in synchromesh transmissions, while GL-5 oils are designed for higher loads and hypoid gears.
How to Choose
the Correct Gearbox Oil
Selecting the right manual gearbox oil involves considering several factors:
1. Consult Your Vehicle’s Manual:
- Your car’s manufacturer provides specific recommendations for gearbox oil type, viscosity, and API rating.
- Always prioritise these guidelines to ensure compatibility and best overall performance.
2. Understand Viscosity Grades:
- Gearbox oils have viscosity grades, such as SAE 75W-90 or 80W-140, indicating their flow characteristics in different temperatures.
- Choose a viscosity grade suitable for your climate and driving conditions.
3. Consider Driving Conditions:
- For high-performance or off-road vehicles, synthetic oils with higher GL ratings are recommended.
- Standard mineral or semi-synthetic oils may suffice for regular commuting and light usage.
4. Check for Additives:
- Many gearbox oils contain additives to improve performance, such as anti-wear agents, corrosion inhibitors, and friction modifiers.
- Ensure the oil you choose includes additives compatible with your transmission system.
5. Seek Expert Advice:
- If you’re unsure, as always, consult a trusted technician or service provider. They can help you select the best oil based on your vehicle’s requirements and usage patterns.
There are some excellent reference sites for UK based customers, which allows you to enter your reg and view an oil reference guide for your car:
Millers: https://www.millersoils.co.uk/which-oil/
Comma: https://www.commaoil.com/
Changing Gearbox Oil
& When To Do It
Regular maintenance is key to extending the life of your transmission. Most manufacturers recommend changing gearbox oil every 30,000 to 60,000 miles, but this interval can vary based on driving conditions and oil type. Signs that it’s time to replace your gearbox oil include:
- Difficulty shifting gears
- Grinding noises
- Leaking transmission fluid
Looking For
Manual Gearbox Oil?
70W
75W
75W-80
75W-85
75W-90
For more information contact
Eco Torque today
Tel: 01462 835335
Email: info@eco-torque.co.uk
Eco Torque Ltd, Unit 1A Portland Industrial Estate, Hitchin Road, Arlesey, United Kingdom, SG15 6SG