How the amount of transmission fluid damages your car

TranSynd transmission fluid is used as a lubricating agent for assemblies and gearbox parts. It is essential for a smooth vehicle operation. Such fluid cools the transmission and protects it from overheating.


There are standards against which recommended to change it every 25.000 to 50.000 kilometers of mileage if the vehicle is operated under severe conditions. 

Non-compliance with recommendations will lead to a quick failure of the automatic transmission and expensive repair. Just one overpressure can lead to heavy friction and premature component wear, pressure valve failure, oil starvation, damage to your vehicle’s engine and transmission.

Too much transmission fluid: what to expect and what to do.

It is worth recalling that only the mixture recommended by the manufacturer should be poured. There are various kinds of oily substances designed for specific car brands. You can find a selection guideline in the accompanying instructions.

Transmission fluids have a complex composition containing:


  • components that prevent the rapid parts oxidation;
  • modifiers;
  • additives (for viscosity, temperature, detergency, etc.).

The most important indicator is viscosity. Therefore, a low transmission fluid, medium viscosity fluid, or semi-synthetic fluid can be used. To check this just read the guidelines carefully and take into account the temperature range over which exceptional properties are maintained.

The surplus is not so dangerous as a deficiency. Internal moving takes place under pressure.

 A large amount of fluid provokes a rapid pressure increase. This leads to blowing and transmission seals leak. Fluid falls into the oil sump. It must be removed and, after cleaning, reinstalled together with a new gasket.


When you find that a lot of fluid has been added, you can remove it yourself. If your transmission is well designed, a drain hole is provided to avoid excess. If not, then the excess fluid can be drained manually using a pump.


How often to change transmission fluid

As mentioned above, it is necessary to change the transmission fluid after the mileage traveled, taking into account the operating conditions.


The first change is recommended in the accompanying guideline for your car. The main indicator for the transmission fluid replacement is its color and thickness. What color is transmission fluid should be? It should be pink on the dipstick and should have a viscosity similar to engine oil. If the color is brown or black, change it immediately.


There are car models where manufacturers do not indicate this process.

Make a replacement in strict accordance with the car model, take into account not only the transmission fluid color but also its marking.


Avoid mixing brands from different manufacturers. This is important even when refilling or partial change.


The first procedure is carried out after 40-60 thousand of mileage. If the vehicle is used intensively, traffic is carried out on unpaved or off-road roads, this indicator is almost halved.


If there is a transmission fluid leak, you should make a total replacement to identify the cause and possible repair of the problem source. Refilling is excluded in such a situation.

How much is needed and how to refill

It is possible to identify the need for refilling at the moment of the level determination in the system. This is done with the gearbox warm and the engine off.

This indicator is determined with a special dipstick. If such a device is not available, it is necessary to unscrew the check plug to find the crankcase hole. If you have a dipstick, follow the next steps.

  • wipe the dipstick dry with a clean cloth;

  • insert it into the crankcase and push it all the way back in;

  • pull it back out and check the indicators;

  • the normal level in the automatic transmission is between the COLD / HOT mark 

If the oil is below the COLD mark, you have to make topping up with the same brand, using a hole for the dipstick.

It is better to use a syringe and a silicone tube from the drip. You must infuse in small portions, constantly monitoring the fluid level.

Both surplus and deficiency can cause malfunction or damage to the gearbox.