JASO MA2
Overview
JASO MA2 oils are formulated to deliver higher clutch frictional performance. They are designed for use in four-stroke motorcycles and scooters and are primarily suitable for wet-clutch applications.
The main physical, chemical and clutch frictional requirements, according to the current version of the standard (JASO T903:2023), for JASO MA2 oils are shown below:
Physical and Chemical
| Requirement | Methods | Unit | Limit |
| Sulphated Ash | D874/JIS K 2272 | % mass | 1.2 max. |
| Phosphorus | D4951/JPI-5S-38 | % mass | ≥0.08 and ≤0.10 |
| Molybdenum | D4951/JPI-5S-38 | ppm | Report |
| Foaming Tendency | |||
| Sequence I |
D892/JIS K 2518
|
mL | 10/0 max. |
| Sequence II | mL | 50/0 max. | |
| Sequence III | mL | 10/0 max. | |
| Evaporation Loss (NOACK) | % mass | 15 max. | |
|
Shear Stability (Kinematic viscosity (100°C) after test) |
D5800/JPI-5S-41 | mm2 |
xW-30 : 9.0 min. xW-40 : 12.0 min. xW-50 : 15.0 min. Others : Stay in grade |
| High Temperature High Shear (HTHS) viscosity | ASTM D62781 | mPas | 2.9 min. |
Note 1 : Test shall be conducted by diesel injector method using the standard test conditions (30 cycles)
Clutch Test Friction Properties (JASO T 903:2023(Annex A))
| Property | JASO MA2 |
| Dynamic Friction Index (DFI) | ≥1.50 and ≤2.50 |
| Static Friction Index (SFI) | ≥1.60 and ≤2.50 |
| Stop Time Index (STI) | ≥1.60 and ≤2.50 |
Note : MA, MA2 and MA1 shall be within the respective ranges described in the table above for each of the three indices (DFI, SFI, and STI).
Submitter may On-File register an oil which satisfies the MA specifications as a MA or MA2 oil depending on the indices specified and marketing requirements.
The significance of the indices:
| Dynamic Friction Index (DFI) | Measure of clutch feel and how progressively power transfers during clutch engagement |
| Static Friction Index (SFI) | Measure of closed clutch pack torque handling capacity – resistance to clutch slip under high-torque “break-away” conditions |
| Stop Time Index (STI) | Measure of how quickly the clutch engages |
For more information on JASO MA2, contact your Lubrizol representative.
For a deeper dive into specifications, see the Lubrizol Ready Reference Guide, the industry's go-to resource for understanding fuel and lubricant performance principles and requirements.