Stable film
A single viscosity grade for engines that stay near one operating temperature for long periods.
Engine Oils
HD Monograde Engine Oils
Cost-effective monograde oils for medium-duty gasoline and diesel engines that require dependable lubricant films and everyday engine protection.
Product family
Straightforward monograde protection for defined operating temperatures.
Monograde oils are still specified where engines run in a narrow temperature window: generators, stationary plant, some agricultural engines and older medium-duty gasoline or diesel units.
They are not a substitute for a modern multi-grade passenger-car oil. Use the table as a layout sample until approved SAE grades are confirmed.
Request Product Guidance
SAE 40
Primary grade
API CF
Performance level
Mono
Viscosity type
Plant
Typical duty
What this family is for
Formulated around the conditions that matter
Simple selection
Choose SAE 30, 40 or 50 from ambient temperature and OEM notes rather than a wide multi-grade map.
Workshop value
A cost-effective option for medium-duty engines that do not need a full synthetic multi-grade.
Sample grades
Viscosity options in this family
Placeholder rows only. Replace with approved grades, specs and typical-use notes when the product data is ready.
| Grade | SAE | Typical use |
|---|---|---|
| SAE 30 | 30 | Moderate climates and lighter medium-duty engines |
| SAE 40 | 40 | Generators, plant and warmer ambient service |
| SAE 50 | 50 | High ambient temperature and older diesel engines |
