You will need to consider all of the criteria mentioned in this buying guide for the best gearbox oils if you want to save time. We will provide detailed information on the characteristics of the oil you should choose to optimize the efficiency of your vehicle.
The type of gearbox oil
Many motorists find it difficult to know how to buy better value for money gearbox oil. We also know that you are one of them, which is why our main advice is to know the type of transmission in your car. This is important information that will influence your choice of oil. In case you are unaware, there are two categories of gearbox oils on the market today.
The first family of gearbox oil is compatible with mechanical transmissions, whether accompanied by manual or robotic gearboxes. This type of oil has the particularity of being particularly thick. That said, it is also suitable for gears. To recognize it more easily, know that it is offered under various names such as EP 75W / 80, EP80W / 90, EP 75W / 90 as well as EP 75W / 140. In addition, it is also available in two types, namely mineral oil which consists of refined crude oil and synthetic oil which has undergone numerous treatments such as distillation or purification.
The second family of gearbox oil is recommended for automatic transmissions. Known as ATF Dexron, it is manufactured by General Motors. It is an oil designed with greater fluidity and which contains a large amount of additives.
Gearbox oil indices
In order for you to be able to define which is the best gearbox oil on the market, you must first know the existing clues. Currently, there are many standards regarding the viscosity of gearbox oils. Again, the choice of oil should be based on the characteristics of your car.
If you have an older model vehicle, then it is highly recommended that you turn to SAE or API. That said, SAE allows you to define the viscosity of the oil in order to know if it is monograde or rather multigrade. Let us take the example of an oil bearing the indications SAE 30, the index 30 makes it possible to indicate quite simply the fluidity of the oil. However, when this factor increases, it means that the oil you are buying is much thicker.
Regarding multigrade viscosity, you will often find indications like SAE 20W50 as an example. This information simply means that this oil has a cold and hot viscosity of 20 and 50 respectively.
Regarding the API standard, it defines the type of oil intended for the transmission. In this case, old cars are more suited to API GL-4 versus API GL-5 for newer vehicles. In addition, do not hesitate to take into account the manufacturer’s recommendations before embarking on a price comparison.
The quality and the price
The quality of the transmission oil you order is essential in order to get the best results from your vehicle. Thus, we recommend that you take all the time necessary to verify this characteristic before proceeding with the purchase. It should be noted that this oil mainly provides lubrication of all components such as gears when necessary.
Know then that the oil to be chosen must have a high resistance to the constraints and to the speed pressure. In this way, you will avoid the risk of diaper breakage. That’s not all, since she should be able to adapt to changes in temperature.
It is not necessarily necessary to spend a large sum for the purchase of gearbox oil. Indeed, offers are currently plentiful and manufacturers are offering more attractive offers.
Hence the need to compare prices. However, you shouldn’t neglect the quality of the oil to keep your entire gearbox system running in the best condition. When you take stock of all this information, you will have no problem knowing how to choose the best gearbox oils of 2021.
Frequently asked Questions
Q1: 75W80 or 75W90 gear oil – what are the differences?
These two types of oils are all multigrade taking into account the presence of the two numerical values displayed. They therefore have the same cold viscosity which is indicated by the number 75 followed by the unit W or Winter. However, they differ in their viscosity when hot, which is reflected in the figure after W. In principle, the higher the value indicated, the less the hot fluidity of the oil will be. Therefore, the hot fluidity of the 75W80 is therefore more important compared to that of the 75W90.
Q2: When to change the gearbox oil?
For an automatic gearbox, the oil change should be done periodically. The frequency of the oil change must be done according to the car models and also according to the recommendations of the manufacturers. Most of them advocate change after 60,000 kilometers. In general, the manual gearbox does not require an oil change, as the majority of manufacturers guarantee its lubrication for the life of the car. However, this should not prevent you from changing the oil during a leak, for example, or when you are working on the gearbox.
Q3: How to change the oil of automatic gearbox?
Park the vehicle on a level surface, turn off the engine and engage the parking brake, then use a jack to jack the car up if you have difficulty accessing the oil pan. Remember to install jacks for more stability. Then make sure the filler cap is not blocked. Then place a container below the stopper to collect all the oil in the can. When the tank is empty, you must also empty the converter. Then put new oil in the gearbox, following the reference given by the manufacturer.
Q4: How many liters of oil for the gearbox?
If it is a manual gearbox, then it will generally take between 2 to 3.5 liters of oil. On the other hand, if it is an automatic transmission, an amount between 3 to 7 liters is necessary to properly lubricate the whole system. However, the amount to use often depends on the car model. Also, rest assured, because your manufacturer provides very precise data on this subject so as not to be mistaken. It is therefore sufficient to follow these recommendations to the letter so that your gearbox will benefit from optimal operation.