Valvolina 75W80 em Audi A3 8P???
- Thread starter Sérgio Cruz
- Data de Início
Eu bem digo que por cada 3 comments acertas um
isso tem a ver com a classificação do oleo. nessa embalagem só sabes a viscosidade. obvio que pela compatibilidade de norma sabes que é feito para trabalhar às temperaturas dessa normal. Logo tanto oleos 75w80, 75w85 como 75w90 são 75w e como a respeitam a norma podes usar o que quiseres. porque é que achas que as marcas metem referencias próprias, para te deixar na dúvida quanto ao oleo a usar nada mais que isso.
Mas fica aqui alguma literatura
SAE Designation of gear oils by viscosity
The Society of Automotive Engineers (SAE) established a viscosity grading system for gear and Engine oils.
According to the SAE viscosity grading system all oils are divided into two classes: monograde and multigrade:
Monograde gear oils
Monograde gear oils are designated by one number (70, 90, 140, 250, etc.). The number indicates a level of the oil viscosity at a particular temperature. The higher the grade number, the higher the oil viscosity.
Viscosity of gear oils designated with a number only without the letter “W” (SAE 80, SAE 90, SAE 140 etc.) was specified at the temperature 212°F (100°C). These gear oils are suitable for use at high ambient temperatures.
Viscosity of gear oils designated with a number followed by the letter “W” (SAE 70W, SAE 75W, SAE 80W etc.) was specified at the temperature 0°F (-18°C). The letter “W” means winter. These grades are used at low ambient temperatures.
Multigrade gear oils
Viscosity of gear oils may be stabilized by polymeric additives (viscosity index improvers). Viscosity of such gear oils is specified at both high and low temperature. These oils are called multigrades and they are designated by two numbers and the letter “W” (SAE 75W-90, SAE 80W-90, SAE 85W-140 etc.). The first number of the designation specify the oil viscosity at cold temperature, the second number specifies the oil viscosity at high temperature.
For example: SAE 85W-140 oil has a low temperature viscosity similar to that of SAE 85W, but it has a high temperature viscosity similar to that of SAE 140.
Multigrade gear oils are used in a wide temperature range.
isso tem a ver com a classificação do oleo. nessa embalagem só sabes a viscosidade. obvio que pela compatibilidade de norma sabes que é feito para trabalhar às temperaturas dessa normal. Logo tanto oleos 75w80, 75w85 como 75w90 são 75w e como a respeitam a norma podes usar o que quiseres. porque é que achas que as marcas metem referencias próprias, para te deixar na dúvida quanto ao oleo a usar nada mais que isso.
Mas fica aqui alguma literatura
SAE Designation of gear oils by viscosity
The Society of Automotive Engineers (SAE) established a viscosity grading system for gear and Engine oils.
According to the SAE viscosity grading system all oils are divided into two classes: monograde and multigrade:
Monograde gear oils
Monograde gear oils are designated by one number (70, 90, 140, 250, etc.). The number indicates a level of the oil viscosity at a particular temperature. The higher the grade number, the higher the oil viscosity.
Viscosity of gear oils designated with a number only without the letter “W” (SAE 80, SAE 90, SAE 140 etc.) was specified at the temperature 212°F (100°C). These gear oils are suitable for use at high ambient temperatures.
Viscosity of gear oils designated with a number followed by the letter “W” (SAE 70W, SAE 75W, SAE 80W etc.) was specified at the temperature 0°F (-18°C). The letter “W” means winter. These grades are used at low ambient temperatures.
Multigrade gear oils
Viscosity of gear oils may be stabilized by polymeric additives (viscosity index improvers). Viscosity of such gear oils is specified at both high and low temperature. These oils are called multigrades and they are designated by two numbers and the letter “W” (SAE 75W-90, SAE 80W-90, SAE 85W-140 etc.). The first number of the designation specify the oil viscosity at cold temperature, the second number specifies the oil viscosity at high temperature.
For example: SAE 85W-140 oil has a low temperature viscosity similar to that of SAE 85W, but it has a high temperature viscosity similar to that of SAE 140.
Multigrade gear oils are used in a wide temperature range.
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