Keeping the gearbox oil in good condition is essential to ensure the proper functioning and durability of the vehicle’s transmission system.
Because this maintenance is often neglected, premature wear of components and high repair costs can occur.
In this article, learn when to change the gearbox oil, how to do it correctly, the warning signs, and the best products to use.
What Is The Gearbox?
The gearbox, also known as the transmission, is the component responsible for transferring power from the engine to the wheels.
It allows you to adjust the speed and torque transmitted to the vehicle, depending on the engine speed and road conditions.
There are two main types of gearbox:
- Manual gearbox: the driver selects the gears manually;
- Automatic gearbox: the gears are selected automatically by the system.
What Is The Gearbox Oil?
Gearbox oil is an essential lubricant for reducing friction between the internal components of the transmission.
It also helps to cool the system, prevents premature wear of the gears, and ensures smooth gear changes.
What Is Gearbox Oil Used For?
In short, the oil in this component allows you to:
- Lubricate internal components;
- Cool the system;
- Prevent corrosion;
- Ensure smooth gear changes;
- Extend the service life of the gearbox.
When Should You Change The Oil In A Manual Gearbox?
The frequency of gearbox oil changes varies depending on the manufacturer and type of vehicle.
If the vehicle makes unusual noises when changing gears, this could be a sign that the oil needs to be replaced.
What Happens If You Don’t Change The Gearbox Oil?
Lack of maintenance leads to:
- Premature wear of gears;
- Gearbox malfunctions;
- Increased fuel consumption;
- Irregular gear changes or blockages.
Does Gearbox Oil Affect Fuel Consumption?
Poor-quality or unsuitable oil can increase friction between the components of the gearbox, forcing the engine to work harder. This results in higher fuel consumption.
Traffic Danger Signs For Safe Driving
What Signs Indicate That You Are Low on Gearbox Oil?
The main signs that you are low on gearbox oil are:
1. Difficulty Shifting Gears
If you feel resistance when shifting gears, this could be a sign of insufficient lubrication.
2. Metallic Noises
Grinding noises or vibrations while driving may indicate that the gears are running without adequate lubrication.
How To Check The Gearbox Oil Level?
In most automatic transmission models, you should:
- Park the vehicle on a level surface and put the gear lever in “P” (parking);
- With the engine running, locate the oil dipstick, which may be identified by a distinctive color;
- Remove the dipstick, wipe it with a rag, reinsert it completely, and remove it again to check the level. The level should be between the “COLD” and “HOT” marks, depending on the fluid temperature.
- Also check the color and odor of the oil. Clean fluid is usually red or light amber in color and should not smell burnt.
On manual gearboxes, remove the level check screw, usually located on the side of the gearbox. If oil starts to drip out slightly, then there is enough oil.
If you do not feel comfortable performing this procedure, we recommend visiting an auto repair shop.
Which Oil Is Used For A Gear Box?
There are specific oils for manual and automatic transmissions. Therefore, you must choose the correct type to avoid damage to the system.
What Is The Best Oil For The Gearbox?
It depends on the vehicle manufacturer’s specifications. However, it is essential to choose an oil with the right viscosity (e.g., 75W-80, 75W-90, ATF).
How To Change The Gearbox Oil?
The process varies between manual and automatic gearboxes. As a general rule, the steps are:
- Raise the vehicle safely using a hydraulic jack and suitable supports;
- Locate the drain plug and place a container to collect the used oil;
- Remove the plug and let the oil drain completely;
- Replace the drain plug;
- Pour the new oil through the filler cap, following the manufacturer’s recommended quantity and specifications;
- Check the oil level and adjust if necessary.
What Tools For Changing Gearbox Oil Are Available In The Kroftools Catalog?
To change the oil in an automatic or manual gearbox effectively, it is crucial to have the right tools.
The KROFtools catalog offers tools that make this task easier:
Fully ATF Exchange And Flush Machine
This is essential equipment for oil changes, as the entire operation is performed automatically.
Click on the image to learn more about the Fully ATF Exchange And Flush Machine (Ref. 9120).
Full Set Special Adapter For ATF Machine
This set includes adapters compatible with various vehicle brands and models, very useful for adapting to the ATF cleaning machine, in order to increase the range of models that can be used.
Click on the image to find out more about the Full Set Special Adapter For ATF Machine (Ref. 9121).
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