- **Safety Equipment**
- **Gloves**: Protects your hands from oil and dirt.
- **Safety glasses**: Shields your eyes from splashes.

- **Tools Required**
- **Socket set**: For removing and tightening the gearbox drain and fill plugs. A ratchet handle with a 10mm and 12mm socket is commonly needed.
- **Torque wrench**: Ensures that the drain and fill plugs are tightened to the manufacturer’s specifications, preventing leaks.
- **Oil drain pan**: Collects old oil during the change. It prevents spills and makes cleanup easier.
- **Funnel**: Helps pour new oil into the gearbox without spills.
- **Rags or paper towels**: For cleaning up any spills and wiping tools.

- **Materials Needed**
- **Gearbox oil**: Check your vehicle’s manual for the recommended type and amount of oil (often 75W-90 or similar).
- **Replacement washers**: These are often required for the drain and fill plugs to prevent leaks. Old washers may not seal properly.

- **Preparation Steps**
- **Park the car on a level surface**: Ensures accurate oil level checking.
- **Engage the handbrake**: Prevents the vehicle from rolling.
- **Gather all tools and materials**: Have everything accessible to avoid interruptions.

- **Draining Old Oil**
- **Locate the gearbox drain plug**: Usually located at the bottom of the gearbox.
- **Position the oil drain pan under the drain plug**: Ensures that old oil drains into the pan.
- **Using the socket wrench, remove the drain plug**: Turn counterclockwise to loosen. Be cautious as old oil may be warm.
- **Allow the old oil to fully drain**: This may take a few minutes.

- **Inspecting Components**
- **Check the drain plug**: Look for damage or excessive wear. If damaged, replace it.
- **Inspect the oil**: If it looks metal-shiny or has a burnt smell, further inspection of the gearbox may be needed.

- **Replacing the Plug**
- **Install a new washer on the drain plug**: Ensures a proper seal.
- **Reinsert the drain plug**: Tighten it clockwise using the socket wrench. Use the torque wrench to tighten it to the specified torque (usually found in the vehicle manual).

- **Filling New Oil**
- **Locate the fill plug**: Usually on the side of the gearbox.
- **Remove the fill plug using the socket wrench**: Turn counterclockwise.
- **Insert a funnel into the fill hole**: Prevents spills while pouring.
- **Pour in the new gearbox oil**: Fill until it starts to trickle out of the fill hole, indicating it’s full.

- **Finalizing the Process**
- **Replace the fill plug**: Install a new washer if necessary, and tighten it with the socket wrench to the specified torque.
- **Clean up any spills**: Use rags or paper towels.
- **Dispose of the old oil and filter properly**: Check local regulations for disposal sites.

- **Testing**
- **Start the vehicle and let it run for a few minutes**: Check for leaks around the plugs.
- **Take the car for a short drive**: Ensure smooth shifting and check for any abnormal noises.

- **Maintenance Check**
- **Regularly check the oil level**: Monitor for any drops in fluid levels, which may indicate leaks or other issues.

This completes your gearbox oil change on a Holden Barina TK.
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