The following change has been made in recommended grades of Indian Oil.
| GRADE NAME | SAE VISCOSITY RATINGS |
| Indian Light | 10-W |
| Indian Light Medium | 20-W |
| Indian Medium | 30 |
| Indian Heavy | 50 |
- For all temperatures above 60° F. use SAE-50
- For all temperatures between 60° F. and 32° F. use SAE-30
- For all temperatures between 32° F. and 0° F. use SAE-20W
- For all temperatures below 0° F. use SAE-10-W
When breaking in new motors do not use heavier than SAE-30 oil regardless of temperature.
The above oil change should be made on all 338 motors at once.
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