Transmission oil: Difference between revisions
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== API Classes == | == API Classes == | ||
Transmission oil (or gear oil) is classified according to the API (American Petroleum Institute) in GL and MT ratings. | 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-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 | * '''GL-2''' - Deprecated: Used for worm-gear-axles and for conditions of load, sliding and temperatures where GL-1 wouldn't suffocate. | ||
* '''GL-3''' - Deprecated: Used for spiral-bevel-axles in mild to moderate conditions. | * '''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-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-5''' - Used for spiral-bevel and hypoid gears with high speed and high torque. | ||
* '''GL-6''' - Obsolete: Designed for very high pinion offset. | * '''GL-6''' - Obsolete: Designed for very high pinion offset. | ||
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== 2nd Gear grinding == | == 2nd Gear grinding == | ||
See: [[Second gear grinding]] | |||
== Recommendations == | == Recommendations == | ||
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* The lowest possible pour point | * The lowest possible pour point | ||
=== Castrol Syntrans FE 75W | === Castrol Syntrans FE 75W === | ||
This oil has fixed the 2nd gear grinding problem for several people. It also meets all the required OEM | This oil has fixed the 2nd gear grinding problem for several people. It also meets all the required OEM criteria. | ||
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Latest revision as of 08:30, 3 December 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 suffocate.
- 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 criteria.
| 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 |