There are many arguments between new and old car owners and generations about gear oil. Some manual owners insist on using high-viscosity oils, while others use ATF. There is always a debate about when to change the oil in a gearbox, and some owners only use synthetic or natural oils.
How to check the gearbox oil level?
Checking your soil’s colour is a good way to gauge its health because these ranges are so large. When new, oils are brightly coloured (usually red) and semi-transparent, but as they degrade or accumulate deposits, they become darker, lose transparency, and smell burnt.
To check your gearbox oil:
Locate the transmission dipstick (Your owner’s manual should show the location). If your model does not have one, you will need to raise your car with a jack or lift, then remove the transmission fill cap carefully.
Remove the dipstick from the filler tube. Insert a ruler, screwdriver, or another implement into the system if your car has been raised.
Make sure the oil is the right colour. If your oil is dark brown, black, or light pink (usually due to water contamination), you need to change it. Red-brown, semi-transparent fluid is often slightly degraded but doesn’t necessarily signify a need for a change.
When to change the gear oil?
In reality, there is no set rule for when to change it. It all depends on your driving conditions and average car temperature. A high-stress driving style will repeatedly raise the temperature of your transmission, eventually causing it to lose its stability. You may need to change your gear oil every 30,000 miles if you regularly tow, drive in low-traction conditions, or drive in mountainous regions.
You usually need a gear oil change after 80,000 miles of normal driving. Manufacturers recommend changing it between 50,000 and 60,000 miles, but this is a maximum.
Under unusual circumstances, other conditions may require a gear oil change. You should replace your gear oil if your transfer case, differential component, or transmission submerge in water or another foreign fluid. Contaminated oil can seriously damage a gearbox, transfer case, or differential with inadequate lubrication.
If your transfer case or differentials recently leaked repaired, you should also replace the gear oil. Leaks may indicate contamination or low oil levels. In most cases, mechanics will replace your gear oil after repairing a leaky component, but home repairs often fail to do so.
Finally, if you or your mechanic find dirty gear oil during a checkup, it should always be replaced. Destabilized viscosity and poor lubrication caused by old or dirty oil will prematurely damage your gearbox, transfer case, and differential.