---
product_id: 578104943
title: "SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil API CK-4/SN 1 Gallon"
brand: "ultra 1plus"
price: "€ 146.21"
currency: EUR
in_stock: true
reviews_count: 8
category: "Ultra 1 Plus"
url: https://www.desertcart.hr/products/578104943-sae-15w-40-full-synthetic-heavy-duty-diesel-engine-oil
store_origin: HR
region: Croatia
---

# 220°C flash point for thermal stability API CK-4/SN certified heavy-duty protection 15W-40 viscosity grade SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil API CK-4/SN 1 Gallon

**Brand:** ultra 1plus
**Price:** € 146.21
**Availability:** ✅ In Stock

## Summary

> 🛢️ Power your fleet with the synthetic edge that keeps engines cleaner, cooler, and running longer!

## Quick Answers

- **What is this?** SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil API CK-4/SN 1 Gallon by ultra 1plus
- **How much does it cost?** € 146.21 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/578104943-sae-15w-40-full-synthetic-heavy-duty-diesel-engine-oil)

## Best For

- ultra 1plus enthusiasts

## Why This Product

- Trusted ultra 1plus brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Emission System Friendly:** Protects DPF, EGR, and after-treatment systems while reducing oil consumption and extending service intervals.
- • **One Oil to Rule Your Fleet:** Universal compatibility with diesel and gasoline heavy-duty engines—simplify maintenance across trucks, tractors, and industrial equipment.
- • **Engineered for Modern Powerhouses:** API CK-4/SN certified to exceed 2020+ on-highway and Tier 4 non-road diesel engine standards.
- • **Extended Engine Life & Cleanliness:** Full synthetic formula combats wear, soot, oxidation, and piston deposits for longer engine durability.
- • **Unmatched Thermal & Shear Stability:** Maintains optimal 15W-40 viscosity under extreme heat and heavy loads, ensuring peak engine performance.

## Overview

ULTRA 1PLUS SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil delivers advanced API CK-4/SN certified protection designed for modern diesel and gasoline engines. Its superior thermal stability and shear resistance maintain optimal viscosity under extreme conditions, reducing wear and emissions system stress. Compatible across mixed fleets, this 1-gallon jug is engineered to extend engine life, improve fuel efficiency, and simplify maintenance for professional-grade performance.

## Description

Buy SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil API CK-4/SN 1 Gallon | Delivers superior wear protection and thermal stability for heavy-duty diesel engines in extreme temperatures and heavy loads: Motor Oils - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Runs cool, well kinda, in Kubota BX2230 - After 20 years I decided to convert my Kubota BX2230 to synthetic oil since everything I've read indicates synthetic is superior in every way. I wish I could say that the tractor now purrs like a kitten at idol but that would not be honest. it still rattles and shakes like a 1960's rock and roll gogo girl. But, that's okay. As long as it keeps running I will be happy.
Review: Works great for my tractors in my truck - It's compatible with all my tractors and trucks. The value for the money is good. It's synthetic, it's durable. It stays pretty clean in my engine for a while, especially on my tractors. I've not had any leakage or sealing issues

## Features

- API CK-4 / SN CERTIFIED 15W-40 FULL SYNTHETIC DIESEL OIL: U1P 15W40 diesel oil xceeds API CK-4, CJ-4, CI-4 PLUS, CH-4 and SN. Specifically engineered for 2020+ on-highway trucks and Tier 4 non-road diesel engines
- SUPERIOR HEAVY-DUTY ENGINE PROTECTION: Advanced full synthetic formula protects against wear, piston deposits, soot thickening, oxidation, shear loss, and aeration — keeping your engine cleaner and running longer
- EXCEPTIONAL SHEAR STABILITY & HIGH-TEMPERATURE PERFORMANCE: Maintains precise 15W-40 viscosity under extreme stress, heat, and heavy loads. Prevents breakdown and delivers reliable protection for long-haul trucks, construction, and agriculture equipment
- REDUCED OIL CONSUMPTION & EMISSIONS SYSTEM COMPATIBILITY: Minimizes oil burn-off while protecting DPF, EGR, and after-treatment systems. Helps extend service intervals and maintain emission compliance
- VERSATILE DIESEL & MIXED FLEET COMPATIBILITY: Backward compatible with all previous four-stroke diesel engines. Also suitable for gasoline heavy-duty applications requiring API SN. One oil for your entire fleet

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B5Y1XWYQ |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #291,459 in Automotive ( See Top 100 in Automotive ) #1,255 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 |
| 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 |

## Product Details

- **Brand:** ULTRA 1PLUS
- **Liquid Volume:** 1 gallons
- **Package Information:** Jug
- **SAE J300 Viscosity Grade:** 15W-40
- **Vehicle Service Type:** Buses, Off-road / Industrial equipment, Truck, Vans

## Images

![SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil API CK-4/SN 1 Gallon - Image 1](https://m.media-amazon.com/images/I/81REEzr7aDL.jpg)
![SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil API CK-4/SN 1 Gallon - Image 2](https://m.media-amazon.com/images/I/81TG85xQTVL.jpg)
![SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil API CK-4/SN 1 Gallon - Image 3](https://m.media-amazon.com/images/I/81HWujrYsnL.jpg)
![SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil API CK-4/SN 1 Gallon - Image 4](https://m.media-amazon.com/images/I/81Us0qA-z9L.jpg)
![SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil API CK-4/SN 1 Gallon - Image 5](https://m.media-amazon.com/images/I/71FY2+FJzmL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Runs cool, well kinda, in Kubota BX2230
*by J***S on June 13, 2024*

After 20 years I decided to convert my Kubota BX2230 to synthetic oil since everything I've read indicates synthetic is superior in every way. I wish I could say that the tractor now purrs like a kitten at idol but that would not be honest. it still rattles and shakes like a 1960's rock and roll gogo girl. But, that's okay. As long as it keeps running I will be happy.

### ⭐⭐⭐⭐⭐ Works great for my tractors in my truck
*by D***G on July 22, 2026*

It's compatible with all my tractors and trucks. The value for the money is good. It's synthetic, it's durable. It stays pretty clean in my engine for a while, especially on my tractors. I've not had any leakage or sealing issues

### ⭐⭐⭐⭐⭐ I like the packaging
*by M***S on September 22, 2025*

Excellent product

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---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-08-26*