Motorex Prisma ZX 75W-90 transmission oil, 1l
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Oil change for the transmission:
A brief discussion on transmission oils:
Specification of transmission oils
Viscosity
To evaluate the viscosity properties of transmission oils, the SAE (Society of Automotive Engineers, USA) specification is used. This standard is used to classify oils into 4 winter classes, marked with a number and "W" (from English: Winter), and 5 summer classes marked with a number.
Winter classes: 70W, 75W, 80W, 85W
Summer classes: 80, 85, 90, 140, 250
If only one class is used in the designation, it means that it is a monograde oil (summer or winter). When a combination of summer and winter classes is used (e.g., 80W-90), it is a multigrade oil or all-season oil. More often, unlike motor oils, manufacturers require monograde transmission oils.
Performance categories
To designate the performance category of transmission oils, the API (American Petroleum Institute, USA) classification is used. The designation of the performance class consists of the letters "GL" (from English: Gear Lubricant) and a number indicating the performance level, of which there are six.
Currently, the following four performance classes are used:
GL-3 - low-additive oils for manually shifted transmissions with medium load
GL-4 - highly additive oils intended primarily for manually shifted transmissions and lightly loaded hypoid gears
GL-5 - oils designed for highly loaded hypoid gears operating under the most severe working conditions, subjected to varying impact loads
GL-6 - oils for hypoid gears working in extreme conditions. They are still used very rarely
Comparison of viscosity classifications of SAE transmission and motor oils
Viscosity classes of transmission oils according to SAE J306A
How to correctly choose transmission oil?
When selecting transmission oil, the same principles apply as when choosing motor oil.
1. The first principle when selecting transmission oil is to follow the manufacturer's instructions for the motorcycle, contained in the manual for each vehicle. Only the transmission manufacturer (of the vehicle) can responsibly say which oil can be used. Practically no manufacturer recommends a specific brand of oil (it contradicts competition laws in the European Union). Transmission manufacturers (of cars) recommend oils based on the so-called performance specification, e.g., API GL-4, API GL-5, and viscosity specification SAE, e.g., 75W, 80W-90.
2. For the oils recommended in this way, the change intervals are determined (usually 10,000 km or 1 year).
3. If you do not have a manual for the vehicle, ask the manufacturer (at the Czech importer headquarters) of the vehicle. Remember, the vehicle manufacturer does not recommend a brand of oil but only the performance and viscosity specification.