---
product_id: 7756979
title: "Castrol Transmax DEX/MERC Automatic Transmission Fluid, 1 Gallon"
brand: "castrol"
price: "28.22 OMR"
currency: OMR
in_stock: true
reviews_count: 8
category: "Castrol"
url: https://www.desertcart.com.om/products/7756979-castrol-transmax-dex-merc-automatic-transmission-fluid-1-gallon
store_origin: OM
region: Oman
---

# 175°C high-temp resistance 4-6 cSt viscosity at 100°C Superior copper corrosion protection Castrol Transmax DEX/MERC Automatic Transmission Fluid, 1 Gallon

**Brand:** castrol
**Price:** 28.22 OMR
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift Smooth, Drive Confident: The Ultimate ATF Upgrade

## Quick Answers

- **What is this?** Castrol Transmax DEX/MERC Automatic Transmission Fluid, 1 Gallon by castrol
- **How much does it cost?** 28.22 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/7756979-castrol-transmax-dex-merc-automatic-transmission-fluid-1-gallon)

## Best For

- castrol enthusiasts

## Why This Product

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

## Key Features

- • **Heat? No Sweat!:** Outstanding high-temperature stability resists oxidation up to 175°C, keeping your transmission cool and efficient.
- • **Corrosion? Not on Our Watch:** Advanced additives provide unsurpassed protection against copper corrosion, extending transmission life.
- • **Smooth Shifting, Every Time:** Enhanced friction durability ensures seamless transmission performance under all conditions.
- • **Trusted Brand, Proven Results:** Castrol’s Smooth Drive Technology delivers reliable performance backed by a 4.8-star rating from over 2,000 users.
- • **Universal Fit, Maximum Efficiency:** One fluid for most stepped and CVT transmissions worldwide—simplify your workshop inventory and boost productivity.

## Overview

Castrol Transmax DEX/MERC is a premium full-synthetic automatic transmission fluid engineered with Smooth Drive Technology. It offers exceptional friction durability, high-temperature oxidation resistance up to 175°C, and superior copper corrosion protection. Compatible with a broad range of stepped and CVT transmissions globally, it streamlines maintenance and enhances transmission longevity, making it a top choice for professionals and enthusiasts alike.

## Description

Castrol Transmax ATF/CVT Universal is a technologically advanced full-synthetic formulation designed to deliver excellent performance in most of the traditional stepped automatic transmissions and Continuously Variable Transmissions currently in use. It is blended with premium base oils and an additive package which utilizes Castrol Smooth Drive Technology. This is the first Castrol multivehicle ATF suitable for use in both step-shifting and continuously variable automatic transmissions. Transmax ATF/CVT Universal is suitable for use in vehicles manufactured in North & South America, Europe, and Asia.

Review: great fluid - so far this is the best mercon fluid ive found, its given me the lowest trans temps of any fluid ive used in my 7.3 dually no matter what im towing
Review: Works. - Honestly can any of us really review this product? Without doing an oil analysis after thousands of miles I can’t tell you if it’s good or not. What I do trust is the brand, I know the fluid is the right spec and I liked the price. That’s what I bought it. I’m using it for DOT III power steering fluid if that matters.

## Features

- Enhanced friction durability for smooth transmission performance
- Superior high temperature protection to effectively resist oxidation
- Unsurpassed protection against copper corrosion
- Broad scope of vehicle applications improves workshop efficiency and inventory management

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00DILUBL6 |
| Best Sellers Rank | #3,268 in Automotive ( See Top 100 in Automotive ) #16 in Transmission Fluids |
| Brand | Castrol |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,195) |
| Date First Available | July 18, 2013 |
| Global Trade Identification Number | 00079191335208 |
| Item Form | Liquid |
| Item Weight | 7.45 pounds |
| Item model number | 03520 |
| Liquid Volume | 128 Fluid Ounces |
| Manufacturer | Castrol |
| Manufacturer Part Number | 03520 |
| Material | Molybdenum Disulfide Calcium Sulfonate |
| Model | 03520 |
| Number of Items | 1 |
| Package Information | Bottle |
| Product Dimensions | 4.62 x 9.5 x 11.52 inches |
| Recommended Uses For Product | Automotive |
| Specific Uses For Product | Automatic Transmission Maintenance, Vehicle Compatibility, Performance Improvement |
| UPC | 079191335208 |
| Unit Count | 128.0 Fluid Ounces |
| Upper Temperature Rating | 175 Degrees Celsius |
| Viscosity | 4 to 6 cSt at 100°C |

## Product Details

- **Brand:** Castrol
- **Liquid Volume:** 128 Fluid Ounces
- **Material:** Molybdenum Disulfide Calcium Sulfonate
- **Package Information:** Bottle
- **Recommended Uses For Product:** Automotive

## Images

![Castrol Transmax DEX/MERC Automatic Transmission Fluid, 1 Gallon - Image 1](https://m.media-amazon.com/images/I/61aEVtXcf5L.jpg)

## Questions & Answers

**Q: Can I use it in a 2000**
A: Honda s2000?  2000 model year Ferrari? 2000 individual mini cooper's? Perhaps the answer isn't in the answer. Perhaps the answer is in the question. As in, why would you touch your vehicle if you can't ask an appropriate question?

**Q: will this work for a 98 jeep cherokee auto 4wd**
A: Here is a link to the list of approved vehicles from Castrol!!!

https://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/1BF017717048528380257EDC004D3B0A/$File/BPXE-9FT8RL.pdf

**Q: does this fluid replaces ATF-Z1?**
A: ATF-Z1 is Dex3 with a friction modifier. This will cover that spec. As the trans ages & wears you may be better served by using a higher viscosity fluid such as AMSOIL ATF. If you are doing a drain & refill, the ffirst one is about 44% new fluid replacement. The 3rd. one will take you to 85%. Think diloution rate vs. volume.

**Q: Can this work w/ toyota camry 1999 uses dexron iii? also, can i mix other brand dexron iii (not for hi mileage) w/ this castrol atf for high mileage?**
A: Yes and yes.  However, in my experience, Dexron VI (even in an old worn transmission) will dramatically improve shift quality even in transmissions rated for Dexron III or Toyota Type IV (which is rebranded Dexron IV).

## Customer Reviews

### ⭐⭐⭐⭐⭐ great fluid
*by C***M on October 4, 2025*

so far this is the best mercon fluid ive found, its given me the lowest trans temps of any fluid ive used in my 7.3 dually no matter what im towing

### ⭐⭐⭐⭐⭐ Works.
*by W***I on May 22, 2025*

Honestly can any of us really review this product? Without doing an oil analysis after thousands of miles I can’t tell you if it’s good or not. What I do trust is the brand, I know the fluid is the right spec and I liked the price. That’s what I bought it. I’m using it for DOT III power steering fluid if that matters.

### ⭐⭐⭐⭐⭐ Price
*by L***E on March 20, 2025*

Very reasonable priced Thank you

## Frequently Bought Together

- Castrol Transmax DEX/MERC ATF, 1 Gallon, Automatic, Black
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- Prestone AS401 DOT 3 Synthetic Brake Fluid - 32 oz.

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-02-20*