---
product_id: 733680779
title: "Fleet Supreme 15W-40 API CK-4 Full Synthetic Diesel Engine Oil | Friction Optimized and Boosted with Molybdenum & Nano-Boron | Superb Powerstroke Performance (5 Gallon)"
price: "164.28 OMR"
currency: OMR
in_stock: true
url: https://www.desertcart.com.om/products/733680779-fleet-supreme-15w-40-api-ck-4-full-synthetic-diesel
store_origin: OM
region: Oman
---

# Fleet Supreme 15W-40 API CK-4 Full Synthetic Diesel Engine Oil | Friction Optimized and Boosted with Molybdenum & Nano-Boron | Superb Powerstroke Performance (5 Gallon)

**Price:** 164.28 OMR
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Fleet Supreme 15W-40 API CK-4 Full Synthetic Diesel Engine Oil | Friction Optimized and Boosted with Molybdenum & Nano-Boron | Superb Powerstroke Performance (5 Gallon)
- **How much does it cost?** 164.28 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/733680779-fleet-supreme-15w-40-api-ck-4-full-synthetic-diesel)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Triax Fleet Supreme 15W-40 API CK-4 Full Synthetic Diesel Engine Oil | Friction Optimized and Boosted with Molybdenum & Nano-Boron | Superb Powerstroke Performance (5 Gallon)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0163GRIUY |
| Best Sellers Rank | #57,242 in Automotive ( See Top 100 in Automotive ) #437 in Motor Oils |
| Brand | Triax |
| Brand Name | Triax |
| Compatible with Vehicle Type | Heavy Duty Diesel Trucks & Equipment (API CK-4) |
| Container Type | Pail |
| Customer Reviews | 4.7 out of 5 stars 398 Reviews |
| Item Weight | 39 Pounds |
| Liquid Volume | 5 Gallons |
| Manufacturer | Triax Lubricants LLC |
| Manufacturer Part Number | F946 |
| Package Information | Pail |
| UPC | 852771008002 |
| Unit Count | 640 Fluid Ounces |
| Vehicle Service Type | Heavy Duty Diesel Trucks & Equipment (API CK-4) |
| Viscosity | 15W-40 |

## Product Details

- **Viscosity:** 15W-40
- **Brand:** Triax
- **Vehicle Service Type:** Heavy Duty Diesel Trucks & Equipment (API CK-4)
- **UPC:** 852771008002
- **Automotive Fit Type:** Universal Fit

## Images

![Fleet Supreme 15W-40 API CK-4 Full Synthetic Diesel Engine Oil | Friction Optimized and Boosted with Molybdenum & Nano-Boron | Superb Powerstroke Performance (5 Gallon) - Image 1](https://m.media-amazon.com/images/I/715WJaL8jPL.jpg)

## Questions & Answers

**Q: Dear triax when ru guys going to start selling your full syn 80/90 gear oil 5gal buckets on amazon? wanting to change oil in the  trans and rear ends**
A: Hello, we do not have an 80W90 synthetic, the only synthetics are 75W90 500k mile oil, SAE 50 and SAE 75W140.  Given all else being equal, 75W90 has significant benefits over 80W90 as it provides probably 3-4% better fuel economy. The viscosity is virtually the same (not much difference). 

The 80W90 is here: https://www.amazon.com/dp/B07BTN2PTL
The 75W90 synthetic is here: https://www.amazon.com/dp/B06XGL7WGZ

**Q: Can someone share oil test results from independent lab? i've noticed oil is not api certified nor mentioned as approved oil in mfg specifications**
A: Hello,

The lubricants we make, with a few exceptions, are not API approved because we do not make cookie cutter formulations. API generally only approves "preset / generic" formulations which are a far cry from what is actually possible performance wise. In order to have API approve any modified formulations, it will cost the manufacturer literally millions of dollars. API is a company, like any other business, in it for the money.  Our oils are very heavily modified especially with regards to friction reduction, oxidation and wear, far beyond standard API cookie cutter formulations, so we are not really interested in this type of "classification". 99% of the oils you buy out there with API license are the same exact 2 or 3 formulations, packaged under hundreds of different brands.

Truth be told, API standards are really not that great when compared to a lot of OEMs, such as VOLVO VDS-4, MAN 3575, VW 507, etc. 
All the tests you see on the spec sheet and product info sheet are validated by third party lab tests. We use at least 2 other labs to verify our own in house testing for each product.

With respect to OEM specs, each oil adpack comes with its own OEM credentials attached. These are based on performance criteria set by OEMs and known generally as “specs”.  This guarantees OEM compliance. However, to get an OEM certification or approval, to have an OEM put your product on their website (formal approval), every oil manufacturer has to pay them separately for each spec and each product . This is essentially a substantial marketing fee. (performance is already approved through the adpack manufacturer).  Needless to say, this significantly changes the  cost of the finished oil and the cost to you, unless one is willing to use a pre-approved cookie cookie-cutter formulation, which we will not. 

That being said, every product we have is backed by a 2 million USD warranty / guarantee against the specs and applications on the product data sheet. We also have 99% customer retention and an exceptional performance track record. Every user is free to test the oil as they see fit. I think our products will change your definition of “Quality”. 

Regards,
Martin
TRIAX Lubricants Tech Group

**Q: is this ok for cummins ISB 275 in a motorhome**
A: On the third photo there is a list of requirements the oil meets, one of them is the Cummins CES 20086 which is the latest standard Cummins has issued and per this link it meets or exceeds all the needs of older Cummins engines http://www.imakenews.com/lubritec/e_article003449158.cfm?x=b11,0,w .  I am currently running this oil in my 5.9 305hp Cummins and plan on having an oil analysis done next year to see how well it holds up.

**Q: How is this for John Deere compact utility tractors? Have a 3320, a 3720 w/turbo, and a gator w/diesel, looking for a one size fits all solution…**
A: It should work exceptionally well.

## Frequently Bought Together

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- Triax Fleet Supreme 5W-40 ESP API CK-4 Full Synthetic Diesel Engine Oil, Friction Optimized and Boosted with Molybdenum and Nano-Boron, Superb Powerstroke Performance (5 Gallon)

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-03-21*