Procurement brief
Commercial fit and product signals
Ultra1Plus SAE 40 Conventional Heavy-Duty Motor Oil API SN/CF is listed for Diesel engines, Fleet maintenance, and Heavy equipment service. The verified catalog signals on this page include SAE 40 and API SN/CF. MAXILUB uses those details as the starting point for product-fit, quantity and package discussions; they do not replace the equipment manufacturer's current requirement.
Current product data sheet
Documented formulation and performance
PDS revised 05/13/2025
Is designed to protect high-speed, four-stroke, naturally aspirated, turbocharged and direct injection Heavy Duty gasoline engines requiring API SN and naturally aspirated and turbocharged diesel engines in which API CF service category is recommended, providing stable wear protection, improved control of oil consumption and piston deposits. Formulated for Heavy Duty and Medium Duty engines operating under severe climatic conditions, using a range of fuels including those with more than 0.5% sulfur, also compatible for models asking for API CD and CE or API SM, SJ, and SF. Formulated with 100% virgin paraffinic base stock combined with an Ultra-premium additive package, this oil contains anti-wear, antioxidant, anti-foaming, detergent, and dispersant agents, delivering strong lubricant film performance and high temperature viscosity stability for anti-wear protection in a wide range of heavy-duty applications. U1P-DUTY SAE 40 Heavy-Duty Motor Oil, API SN/CF protects the engine rings for maximum combustion compression and minimal engine wear, minimizes valve and piston crown deposits, and the Ultra-anti-wear additive protects the valve train and other highly loaded parts. The viscosity index improver additive ensures excellent film protection in hot engine areas.
Documented benefits
- Improves engine efficiency, protection, and durability
- Fits diesel and gasoline engines
- Controls high-temperature oxidation and deposits
- Maximum performance and protection at high temperatures
- Saves fuel, reduces heat, and minimizes oil consumption
Typical properties from the PDS
| Appearance | Amber, liquid |
|---|---|
| Viscosity @ 40 deg C, cSt, ASTM D445 | 127.6 |
| Viscosity @ 100 deg C, cSt, ASTM D445 | 13.0 |
| Viscosity index, ASTM D2270 | 95 |
| Pour point, deg C, ASTM D97 | -5 |
| Flash point, deg C, ASTM D92 | 195 |
Documented presentations
- 1 US Gallon
- 5 Gallon Pail
- 55 Gallon Drum
- 265 Gallon Tote
Confirm current package availability and order quantity with the MAXILUB sales team.
Typical values summarize the referenced PDS and are not purchase specifications. Confirm current product requirements, approvals and package availability before ordering.
Open complete PDSMatch diesel oil to engine generation and duty cycle.
Commercial diesel selection starts with the engine maker's viscosity and API requirement, then accounts for idle time, load, emissions equipment and planned drain intervals. Provide the engine population and maintenance schedule when requesting a fleet supply recommendation.
API category and OEM requirement
This listing identifies SAE 40 and API SN/CF; confirm each requirement against the vehicle or equipment manual.
Operating load, idle time and climate
The indexed applications include Diesel engines, Fleet maintenance, and Heavy equipment service; provide the exact asset or service use with the request.
Fleet consumption and replenishment frequency
Package sizes, order quantity and delivery timing are confirmed with the commercial quote.
Common applications
Commercial sectors
Where this product enters a South Florida supply plan.
Review the purchasing priorities for the operations that commonly evaluate this product, then include the application, quantity and delivery ZIP with your request.
Commercial Fleets
Lubrication planning for vehicles that need to stay in service.
View industry guidanceHeavy-Duty Trucking
Heavy-duty lubricant supply for maintenance shops, terminals and operators.
View industry guidanceConstruction & Heavy Equipment
Fluids for equipment maintenance, hydraulic systems and field service needs.
View industry guidanceAgriculture
Lubricants and fluids for farm equipment, service crews and seasonal operations.
View industry guidanceVerified product details
| Product SKU | UL310 |
|---|---|
| Viscosity grade | SAE 40 |
| API / industry specifications | API SN/CF |
| Package size | Quote for available package sizes |
| Country of origin | Made in USA |
Use only where the vehicle or equipment manufacturer specifies this viscosity and performance level.






