JASO MA1 oils are formulated 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 MA1 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 MA1
Dynamic Friction Index (DFI) ≥1.35 and ≤1.50
Static Friction Index (SFI) ≥1.45 and ≤1.60
Stop Time Index (STI) ≥1.40 and ≤1.60

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 MA1 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 MA1, contact your Lubrizol representative.