JASO FC
Overview
JASO FC oils are defined for low smoke performance and deliver superior performance to JASO FB in terms of exhaust smoke and exhaust system blocking. They are designed for use in two-stroke motorcycles and small engine equipment.
The main physical, chemical and engine test requirements, according to the current version of the standard (JASO M345:2018), for JASO FC oils are shown below:
Physical and Chemical
| Requirement | Methods | Unit | Limit |
| Kinematic Viscosity (100°C) | D445/K 2283 | mm2/s | 6.5 min. |
| Flash Point | D92 or D93/K 2265 | °C | 70 min. |
| Density (15°C) | D1298/K 2249 | g/cm3 | Report |
| Pour Point | D97/K 2269 | °C | Report |
| Colour (visual inspection) | D1500 | Report | |
| Sulphated Ash | D874/K 2272 | % mass | 0.25 max. |
| Phosphorus | D4951/JPI-5S-38-92 | % mass | Report |
| Nitrogen | D4629/K 2609-1990 | % mass | Report |
| Sulphur | D2662/K 2541-1992 | % mass | Report |
Engine Testing (JASO FC)
| Evaluation Item | Test Method |
JASO FC Standard Index |
| Honda Lubricity (LIX) | JASO M 340 | 103 min. |
| Initial Torque (TIX) | JASO M 340 | 98 min. |
| Honda Detergency (1 hour) DIX | JASO M 341 | 95 min. |
| Suzuki Smoke (SIX) | JASO M 342 | 85 min. |
| Suzuki Blocking (BIX) | JASO M 343 | 90 min. |
The significance of the index numbers:
The numbers for each evaluated item, i.e., Lubricity, Initial Torque, Detergency, Smoke and Blocking are all index numbers which are associated with performance in each category. Basically, the higher the number, the better the performance in that category.
For more information on JASO FC, contact your Lubrizol representative.