BMW Motorrad Synthetic Gear Oil OSP 75W-90, 1l
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Transmission oil change:
A brief discussion about transmission oils:
Specifications of transmission oils
Viscosity
The specification SAE (Society of Automotive Engineers, USA) is used to evaluate the viscosity properties of transmission oils. This standard is used to classify oils into 4 winter grades, marked with a number and “W” (from English Winter), and 5 summer grades marked with a number.
Winter grades: 70W, 75W, 80W, 85W
Summer grades: 80, 85, 90, 140, 250
If only one grade is used in the designation, it indicates that it is a monograde oil (summer or winter). When a combination of summer and winter grade is used (e.g., 80W-90), it is a multigrade oil or all-season oil. Unlike motor oils, transmission oils are often required by manufacturers to be monograde.
Performance categories
The performance category of transmission oils is designated using the API classification (American Petroleum Institute, USA). The designation of the performance class consists of the letters "GL" (from English Gear Lubricant) followed by a number indicating the performance level, of which there are six.
The following four performance classes are currently used:
GL-3 - low-additive oils for manually shifted transmissions under medium stress
GL-4 - highly additive oils primarily intended for manually shifted transmissions and lightly loaded hypoid gears
GL-5 - oils intended for heavily loaded hypoid gears, operating under the most severe conditions, exposed to variable shock loads
GL-6 - oils for hypoid gears operating in extreme conditions. They are still used very rarely.
Comparison of SAE viscosity classifications of transmission and motor oils
Viscosity classes of transmission oils according to SAE J306A
How to choose the right transmission oil?
When selecting transmission oil, the same principles apply as when selecting motor oil.
1. The first principle when choosing transmission oil is to follow the manufacturer’s instructions contained in the manual for each vehicle. Only the manufacturer of the transmission (vehicle) can responsibly state which oil can be used. Practically no manufacturer recommends a specific oil brand (this is contrary to competition laws in the European Union). Transmission manufacturers (automobile manufacturers) recommend oils based on performance specifications, e.g., API GL-4, API GL-5, and viscosity specifications SAE, e.g., 75W, 80W-90.
2. For such recommended oils, the replacement intervals are determined (usually 10,000 km or 1 year).
3. If you do not have the vehicle manual, ask the manufacturer (at the Czech headquarters of the importer) of the vehicle. Remember, the vehicle manufacturer does not recommend an oil brand, but only a performance and viscosity specification.
Data sheet
- Manufacturer:
- BMW
- Type of consumable material:
- Oils
Specific References
- EAN13
- 83222445460