---
product_id: 504059816
title: "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"
brand: "ultra 1plus"
price: "¥26031"
currency: JPY
in_stock: true
category: "Ultra 1 Plus"
url: https://www.desertcart.jp/products/504059816-sae-15w-40-full-synthetic-heavy-duty-diesel-engine-oil
store_origin: JP
region: Japan
---

# API CK-4/SN certified for cutting-edge engine protection Stable 15W-40 viscosity under extreme heat & stress Full synthetic formula guards against wear & deposits 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

**Brand:** ultra 1plus
**Price:** ¥26031
**Availability:** ✅ In Stock

## Summary

> 🚛 Power your fleet with the ultimate synthetic shield—because your engine deserves the best.

## Quick Answers

- **What is this?** 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 by ultra 1plus
- **How much does it cost?** ¥26031 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/504059816-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

- • **Next-Gen Engine Defense:** API CK-4/SN certification ensures your diesel engine runs cleaner and longer, built for 2020+ trucks and Tier 4 engines.
- • **Extended Service Intervals:** Advanced synthetic formula minimizes wear and oxidation, letting you push your maintenance schedule further without compromise.
- • **One Oil to Rule Your Fleet:** Backward compatible with all four-stroke diesel engines and gasoline heavy-duty vehicles—simplify maintenance with a universal solution.
- • **Cleaner Engines, Lower Emissions:** Reduces oil consumption and protects emission systems like DPF and EGR, keeping your fleet compliant and green.
- • **Unmatched Thermal & Shear Stability:** Maintains optimal viscosity even under heavy loads and scorching temperatures—no breakdowns, just relentless performance.

## Overview

ULTRA 1PLUS SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil is a premium API CK-4/SN certified lubricant designed for modern diesel and gasoline heavy-duty engines. It delivers superior wear protection, exceptional shear stability, and thermal resilience, ensuring cleaner engines, reduced oil consumption, and extended service intervals. Compatible across mixed fleets, it safeguards emission systems while maintaining optimal viscosity under extreme conditions.

## 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

## 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 | #100,516 in Automotive ( See Top 100 in Automotive ) #647 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 |
| 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 |

## 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 | Delivers superior wear protection and thermal stability for heavy-duty diesel engines in extreme temperatures and heavy loads - Image 1](https://m.media-amazon.com/images/I/81REEzr7aDL.jpg)

## Available Options

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

## Frequently Bought Together

- Ultra 1Plus SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil - 15W 40 Motor Oil API CK-4/SN (1 Gallon)
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**Shop now:** [https://www.desertcart.jp/products/504059816-sae-15w-40-full-synthetic-heavy-duty-diesel-engine-oil](https://www.desertcart.jp/products/504059816-sae-15w-40-full-synthetic-heavy-duty-diesel-engine-oil)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-09-02*