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🛢️ Power your diesel with the ultimate synthetic shield—because your engine deserves the best.
ULTRA 1PLUS SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil is a premium, API CK-4/SN certified lubricant engineered for modern on-highway trucks and Tier 4 non-road diesel engines. Its advanced synthetic formula delivers superior wear protection, exceptional shear stability, and thermal resilience under extreme conditions. Compatible with a wide range of diesel and gasoline heavy-duty vehicles, it supports emission system health while reducing oil consumption and extending maintenance intervals.





| ASIN | B0B5Y1XWYQ |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #91,878 in Automotive ( See Top 100 in Automotive ) #615 in Motor Oils |
| Brand | ULTRA 1PLUS |
| Brand Name | ULTRA 1PLUS |
| Compatible with Vehicle Type | Buses, Off-road / Industrial equipment, Truck, Vans |
| Container Type | Jug |
| Customer Reviews | 4.7 out of 5 stars 74 Reviews |
| Flash Point | 220 °C |
| Included Components | Motor Oil |
| Item Highlight | Delivers superior wear protection and thermal stability for heavy-duty diesel engines in extreme temperatures and heavy loads |
| Liquid Volume | 1 gallons |
| Manufacturer | Ultrachem LLC |
| Manufacturer Part Number | UFS1540CK4SNG |
| Manufacturer Warranty Description | 22 |
| Model Number | UL108 |
| Number of Packs | 1 |
| Package Information | Jug |
| SAE J300 Viscosity Grade | 15W-40 |
| Size | 1 Gallon |
| UPC | 810050658966 |
| Unit Count | 128 Fluid Ounces |
| Vehicle Service Type | Buses, Off-road / Industrial equipment, Truck, Vans |
| Viscosity Level | Medium to High |
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