---
product_id: 321925241
title: "Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal"
brand: "castrol"
price: "€ 179.07"
currency: EUR
in_stock: true
reviews_count: 13
category: "Castrol"
url: https://www.desertcart.nl/products/321925241-castrol-transynd-668-synthetic-automatic-transmission-fluid-1-gal
store_origin: NL
region: Netherlands
---

# Thermal & oxidative stability Superior gear protection Extended anti-shudder & clutch durability Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal

**Brand:** castrol
**Price:** € 179.07
**Availability:** ✅ In Stock

## Summary

> 🛠️ Drive with confidence, shift with power — Castrol TranSynd 668 has your back!

## Quick Answers

- **What is this?** Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal by castrol
- **How much does it cost?** € 179.07 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/321925241-castrol-transynd-668-synthetic-automatic-transmission-fluid-1-gal)

## 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-Resistant Formula:** Prevents oil thickening even under extreme temperatures 🔥
- • **Unmatched Gear Defense:** Keeps your transmission running smoother, longer ⚙️
- • **Shudder-Free Performance:** Say goodbye to jerks and shudders on every drive 🛡️
- • **Trusted by Pros, Loved by Drivers:** 4.8-star rating with over 1,000 reviews proves it’s the real deal
- • **Universal Fit, Ultimate Compatibility:** Works seamlessly with Allison, NP, Magna, and more

## Overview

Castrol TranSynd 668 Synthetic Automatic Transmission Fluid is a premium, universal-fit fluid engineered for superior gear protection, extended clutch and anti-shudder durability, and excellent resistance to corrosion and foaming. Its advanced thermal and oxidative stability prevents deposits and oil thickening, ensuring smooth, reliable transmission performance across a wide range of vehicles, including Allison transmissions. Highly rated by professionals and drivers alike, it’s the go-to choice for maintaining peak transmission health.

## Description

Buy Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal: Fuel Additives - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great deal for oil - Just what I needed for my truck and will buy more to complete my transmission oil change!
Review: Only fluid to use in any Allison transmission - Started using Tes fluids 8 years ago in my 2005 duramax. Trans developed a shudder and jerking motion going downhill in cruise control. Called Allison tech support. Was told Dex VI wasn't good enough to protect 1000 series trans internals and seals. Changed to Tes 295 and all trans symptoms disappeared. Did forward system flush to get all Dex VI out of the system. 4 gal. Now I'm using 668. 322,000 mi and the trans shifts like new. Can be used in NP and Magna 263 and 261 transfer cases . I do a pan drain every 2 years and canister filter every 12 mo. The cleaner the fluid the cooler it runs.

## Features

- Delivers improved gear protection.
- Delivers extended anti-shudder durability.
- Delivers extended clutch-friction durability.
- Excellent corrosion and foaming resistance.
- Excellent thermal and oxidative stability that helps to prevent deposits and oil thickening.
- Fit type: Universal

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B095SZB2DK |
| Best Sellers Rank | #5,272 in Automotive ( See Top 100 in Automotive ) #24 in Transmission Fluids |
| Brand | Castrol |
| Brand Name | Castrol |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 1,073 Reviews |
| Item Form | Liquid |
| Liquid Volume | 1 gallons |
| Material | Synthetic |
| Number of Items | 1 |
| Number of Packs | 1 |
| Package Information | Bottle |
| Part Number | TES 668 |
| Recommended Uses For Product | Automotive |
| UPC | 079191219164 |
| Unit Count | 128 Fluid Ounces |

## Product Details

- **Brand:** Castrol
- **Liquid Volume:** 1 gallons
- **Material:** Synthetic
- **Package Information:** Bottle
- **Recommended Uses For Product:** Automotive

## Images

![Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal - Image 1](https://m.media-amazon.com/images/I/71RP2LrvVRL.jpg)
![Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal - Image 2](https://m.media-amazon.com/images/I/510jQvr1cIS.jpg)
![Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal - Image 3](https://m.media-amazon.com/images/I/51fS+M5Xa4S.jpg)
![Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal - Image 4](https://m.media-amazon.com/images/I/51ZQ2Q2uaES.jpg)

## Available Options

This product comes in different **Number Of Items** options.

## Questions & Answers

**Q: Can I use this in my 2001 silverado 2500hd with an allison transmission?**
A: Yes, I recommend flushing and filter (Both) try to remove as much of the Dino oil as possible.
Transcend works wonderfully in my '01 and '05 Chev Allisons

**Q: Can this be use with nissan rogue 2017?**
A: no

**Q: Ok for Genesis 80 2017**
A: no

**Q: I am trying to find the color of the fluid. Not able to find it on the product description. Any comments?**
A: It's red. Just like the older version.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great deal for oil
*by R***G on September 3, 2026*

Just what I needed for my truck and will buy more to complete my transmission oil change!

### ⭐⭐⭐⭐⭐ Only fluid to use in any Allison transmission
*by M***5 on February 26, 2026*

Started using Tes fluids 8 years ago in my 2005 duramax. Trans developed a shudder and jerking motion going downhill in cruise control. Called Allison tech support. Was told Dex VI wasn't good enough to protect 1000 series trans internals and seals. Changed to Tes 295 and all trans symptoms disappeared. Did forward system flush to get all Dex VI out of the system. 4 gal. Now I'm using 668. 322,000 mi and the trans shifts like new. Can be used in NP and Magna 263 and 261 transfer cases . I do a pan drain every 2 years and canister filter every 12 mo. The cleaner the fluid the cooler it runs.

### ⭐⭐⭐⭐⭐ Good stuff !
*by P***E on September 12, 2026*

Top shelf & recommended transmission fluid for Allison 1000 transmissions. Never use anything else and Amazon has the best deal.

## Frequently Bought Together

- Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 1 GALLON ONLY BY DOXA WORLDWIDE
- Allison 29539579 Screw-on Filter with Magnet Filter Kit replacing filter for Allison transmission per OEM Specs, For utility terrain vehicles
- ACDelco GM Original Equipment PF2232 Engine Oil Filter

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-09-19*