---
product_id: 330979480
title: "Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid, 5 Gallon Pail"
brand: "castrol"
price: "€ 547.98"
currency: EUR
in_stock: true
reviews_count: 8
category: "Castrol"
url: https://www.desertcart.it/products/330979480-castrol-transynd-668-full-synthetic-automatic-transmission-fluid-5-gallon
store_origin: IT
region: Italy
---

# Up to 300,000 miles extended drain interval Full-synthetic formula for peak performance Superior shear stability for gear protection Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid, 5 Gallon Pail

**Brand:** castrol
**Price:** € 547.98
**Availability:** ✅ In Stock

## Summary

> ⚙️ Keep your transmission running smoother, longer—because your ride deserves the best.

## Quick Answers

- **What is this?** Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid, 5 Gallon Pail by castrol
- **How much does it cost?** € 547.98 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/330979480-castrol-transynd-668-full-synthetic-automatic-transmission-fluid-5-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

- • **Bulk 5-Gallon Pail:** Ideal for professional-grade maintenance or fleet servicing—never run low on premium fluid
- • **Unmatched Longevity:** Drain intervals up to 12x longer than conventional fluids, saving time and money
- • **Tailored for Allison:** Specifically engineered to meet ALLISON TES 468 standards for flawless transmission compatibility
- • **Anti-Shudder Durability:** Enhanced clutch-friction durability ensures smooth, shudder-free shifts under all conditions
- • **Rock-Solid Gear Protection:** Advanced shear stability maintains viscosity, reducing wear and extending transmission life

## Overview

Castrol TranSynd 668 is a premium full-synthetic automatic transmission fluid designed exclusively for ALLISON transmissions. It supports extended drain intervals up to 300,000 miles in general-duty use and offers superior shear stability to protect gears and clutches, ensuring enhanced durability and smooth shifting. Packaged in a convenient 5-gallon pail, it’s the go-to choice for professionals and fleet managers seeking reliable, long-lasting transmission performance.

## Description

TranSynd is a full-synthetic, automatic transmission fluid designed specifically for ALLISON transmissions.

Review: Excellent value - Excellent value for complete service of your Allison transmission
Review: Liquid gold - I have a 2007 Fleetwood Discovery 40x. I wanted to service the transmission and this was the preferred fluid. Great buy delivered straight to my door

## Features

- TranSynd is a full-synthetic, automatic transmission fluid designed specifically for ALLISON transmissions / TES 468 is now covered by TranSynd 668
- Allows for extended drain intervals of up to 300,000 miles / 48 months in general-duty transmissions and up to 150,000 miles / 48 months in severe-duty transmissions
- 12 times longer drain intervals than conventional and other non-TES 668 and non0-TES 295 fluids
- Shear stability that helps maintain a stable viscosity which provides wear protection in gears throughout the drain interval
- Improved gear protection, extended anti-shudder durability and extended clutch-friction durability

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN  | B0977Q8S49 |
| Best Sellers Rank | #13,903 in Automotive ( See Top 100 in Automotive ) #56 in Transmission Fluids |
| Customer Reviews | 4.8 4.8 out of 5 stars (286) |
| Item model number  | 15E2E0 |
| Manufacturer  | Castrol |
| Package Dimensions  | 16.2 x 12.5 x 12.5 inches; 38 Pounds |
| UPC  | 079191219638 |

## Product Details

- **Brand:** Castrol
- **Item Weight:** 38 Pounds
- **Liquid Volume:** 640 Fluid Ounces
- **Material:** Synthetic
- **Package Information:** Pail

## Images

![Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid, 5 Gallon Pail - Image 1](https://m.media-amazon.com/images/I/614yvBQo87L.jpg)

## Questions & Answers

**Q: Este aceite sirve para camiones con transmisión mecánica**
A: No , es solo para transmision automatica.

**Q: What is the shelf life of an unopened container?**
A: Castrol recommends a recheck time of 48 months from the date of manufacture for Castrol TranSynd 668.

**Q: What is the shelf life of an open container in resealed**
A: Castrol recommends a recheck time of 48 months from the date of manufacture for Castrol TranSynd 668.

**Q: Will this work on thw allison 1000?**
A: Castrol always recommends following the guidelines of the original engine manufacturer for the recommended fluid for use in your specific application. This information can be found in the vehicle's owner's manual or by contacting the manufacturer directly. Before using any lubricant, ensure that the lubricant product specifications meet or exceed the lubricant specifications required by the Original Equipment Manufacturer (OEM) for that specific use.

According to Castrol's Recommendations Guide recommended for Allison 1000 Series transmissions, fluid meeting Allison TES-295 is recommended.  Castrol TranSynd 668 full synthetic transmission fluid carries the Allison specification TES 668 approval.  Allison TES 668 is backward compatible with Allison TES 295 and Allison TES 468, so Castrol TranSynd 668 can be used in applications that call for Allison TES 295 or Allison TES 468 fluid.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent value
*by J***X on November 24, 2025*

Excellent value for complete service of your Allison transmission

### ⭐⭐⭐⭐⭐ Liquid gold
*by K***N on January 6, 2026*

I have a 2007 Fleetwood Discovery 40x. I wanted to service the transmission and this was the preferred fluid. Great buy delivered straight to my door

### ⭐⭐⭐⭐⭐ Specified oil and thus does the job well
*by M***H on December 7, 2025*

Specified oil for the cummins transmission and thus does the job well.

## Frequently Bought Together

- Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid, 5 Gallon Pail
- Allison Filter Kit - 29539579 Screw-on Filter with Magnet - Entire kit for replacing filter on Alison transmission per OEM Specs. True OEM Filter!
- Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 1 GALLON ONLY BY DOXA WORLDWIDE

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-01-24*