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🛢️ Power your fleet with the ultimate synthetic edge—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. Designed to reduce oil consumption and protect emission systems, it supports longer service intervals and fleet-wide versatility for diesel and gasoline heavy-duty vehicles.





| ASIN | B0B5Y1XWYQ |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #185,233 in Automotive ( See Top 100 in Automotive ) #921 in Motor Oils |
| Brand Name | ULTRA 1PLUS |
| Compatible with Vehicle Type | Buses, Off-road / Industrial equipment, Truck, Vans |
| Container Type | Jug |
| Customer Reviews | 4.7 4.7 out of 5 stars (74) |
| 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 |
| SAE J300 Viscosity Grade | 15W-40 |
| Size | 1 Gallon |
| UPC | 810050658966 |
| Unit Count | 128 Fluid Ounces |
| Viscosity Level | Medium to High |
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