Transmission oil: Difference between revisions
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[[Category:Oil and other fluids]] | [[Category:Oil and other fluids]] | ||
== API Classes == | |||
Transmission oil (or gear oil) is classified according to the API (American Petroleum Institute) in GL and MT ratings. | |||
* '''GL-1''' - Deprecated: Used for mild conditions and low unit pressures. Contains oxidation and rust inhibitors, defoamers and pour depressants. | |||
* '''GL-2''' - Deprecated: Used for worm-gear-axles and for conditions of load, sliding and temperatures where GL-1 wouldn't sufficate. | |||
* '''GL-3''' - Deprecated: Used for spiral-bevel-axles in mild to moderate conditions. | |||
* '''GL-4''' - Used for spiral-bevel and hypoid gears with moderate speeds and loads. | |||
* '''GL-5''' - Used for spiral-bevel and hypoid gears with high speed and high torque. | |||
* '''GL-6''' - Obsolete: Designed for very high pinion offset. | |||
* '''GMT-1''' - Used for non-synchronized manual transmission like buses and heavy-duty trucks. Exceeds the protection requirements of GL-4 and GL-5. | |||
== OEM Specifications == | == OEM Specifications == | ||
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== Recommendations == | == Recommendations == | ||
Generally speaking you want: | |||
* Meet or exceed the OEM specification | |||
* The highest possible flashing point | |||
* The lowest possible pour point | |||
=== Castrol Syntrans FE 75W === | === Castrol Syntrans FE 75W === | ||
Revision as of 11:44, 21 November 2019
API Classes
Transmission oil (or gear oil) is classified according to the API (American Petroleum Institute) in GL and MT ratings.
- GL-1 - Deprecated: Used for mild conditions and low unit pressures. Contains oxidation and rust inhibitors, defoamers and pour depressants.
- GL-2 - Deprecated: Used for worm-gear-axles and for conditions of load, sliding and temperatures where GL-1 wouldn't sufficate.
- GL-3 - Deprecated: Used for spiral-bevel-axles in mild to moderate conditions.
- GL-4 - Used for spiral-bevel and hypoid gears with moderate speeds and loads.
- GL-5 - Used for spiral-bevel and hypoid gears with high speed and high torque.
- GL-6 - Obsolete: Designed for very high pinion offset.
- GMT-1 - Used for non-synchronized manual transmission like buses and heavy-duty trucks. Exceeds the protection requirements of GL-4 and GL-5.
OEM Specifications
Honda states that you should use Honda MTF which is specified as:
- 75W-80 viscosity
- Meets GL-4 Spec
2nd Gear grinding
See: Second_gear_grinding
Recommendations
Generally speaking you want:
- Meet or exceed the OEM specification
- The highest possible flashing point
- The lowest possible pour point
Castrol Syntrans FE 75W
This oil has fixed the 2nd gear grinding problem for several people. It also meets all the required OEM criterias.
| Flash Point, ºC (ASTM D92) | 226 |
| Pourpoint, ºC (ASTM D97) | -51 |
| Density, @15ºC, g/ml (ASTM D4052) | 0,852 |
| Viscosity, @40ºC, (ASTM D445) | 32,2 |
| Viscosity, @100ºC, (ASTM D445) | 6,3 |
| Viscosity index (DIN ISO 2909) | 154 |
| API | GL-4 |