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Changing the gearbox oil (also known as transmission fluid) in a Mitsubishi Montero is an important maintenance task that helps ensure your vehicle runs smoothly. I’ll guide you through the process step-by-step, explaining everything along the way. Before you start, make sure you have all the necessary tools and materials ready.

### Tools and Materials Needed

1. **Tools:**
– Socket set (with ratchet)
– Wrench set
– Screwdriver set
– Oil catch pan
– Funnel
– Torque wrench (if specified by the manufacturer)

2. **Materials:**
– Gearbox oil (transmission fluid) – Check your owner’s manual for the correct type and amount.
– New transmission filter (if applicable)
– New gasket or sealing compound (if needed)
– Clean rags or paper towels
– Safety goggles and gloves

### Step-by-Step Guide

#### 1. **Preparation**

– **Safety First:** Make sure your vehicle is parked on a flat surface and the engine is turned off. Engage the parking brake. Wear safety goggles and gloves to protect yourself from oil and debris.

– **Gather Materials:** Have all your tools and materials ready. Check your owner’s manual for the type of gearbox oil needed for your Mitsubishi Montero.

#### 2. **Lifting the Vehicle**

– If necessary, use a car jack to lift the front of the vehicle and support it securely with jack stands. Ensure the vehicle is stable before crawling under it.

#### 3. **Locate the Gearbox Oil Drain Plug**

– **Finding the Drain Plug:** The gearbox oil drain plug is usually located at the bottom of the transmission. It may be a bolt or a plug that you can remove with a socket or wrench.

– **Prepare to Catch Oil:** Place the oil catch pan under the drain plug to catch the old fluid.

#### 4. **Drain the Old Gearbox Oil**

– **Remove the Drain Plug:** Carefully unscrew the drain plug using the appropriate socket or wrench. Be cautious, as the oil may be warm if the engine has been running.

– **Let it Drain:** Allow the old oil to drain completely into the catch pan. This may take a few minutes.

#### 5. **Replace the Drain Plug**

– **Reinstall the Drain Plug:** Once all the oil has drained, clean the area around the drain hole and the plug. Then, reinstall the drain plug and tighten it securely (but do not overtighten).

#### 6. **Replace the Transmission Filter (Optional)**

– **Access the Filter:** If your Montero has a transmission filter that needs to be changed, locate it (usually near the gearbox). You may need to remove a cover or some components to access it.

– **Remove the Old Filter:** Unscrew or unclip the old filter and let any remaining oil drain out.

– **Install the New Filter:** Position the new filter and secure it in place according to the manufacturer’s instructions.

#### 7. **Add New Gearbox Oil**

– **Locate the Fill Plug:** Find the fill plug on the transmission (it’s usually on the side or top).

– **Remove the Fill Plug:** Use a socket or wrench to remove the fill plug.

– **Add New Oil:** Using a funnel, pour the new gearbox oil into the fill hole. Check your owner’s manual for the correct amount of oil needed.

#### 8. **Check the Oil Level**

– **Check Level:** After adding oil, it’s important to check the level. You can do this by using a dipstick (if available) or by feeling the oil level from the fill hole.

– **Add More Oil if Necessary:** If the level is low, add more oil until it reaches the correct level.

#### 9. **Replace the Fill Plug**

– Once you’ve added the correct amount of oil, re-install the fill plug download Mitsubishi Montero workshop manual and tighten it securely.

#### 10. **Clean Up and Test Drive**

– **Clean Up:** remove the oil catch pan and dispose of old oil and any materials properly at a recycling center.

– **Check for Leaks:** Start the engine and let it run for a minute. Check for any leaks around the drain plug and fill plug.

– **Test Drive:** take your Montero for a short test drive to ensure everything is working properly. Pay attention to the shifting of gears and any unusual noises.

### Conclusion

Congratulations! You’ve successfully changed the gearbox oil in your Mitsubishi Montero! Regular maintenance like this can help prolong the life of your vehicle and ensure it runs smoothly. Always refer to your owner’s manual for specific details Related to your model, and don’t hesitate to ask for help if you’re unsure about any step. Happy driving!
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