---
product_id: 769681198
title: "Castrol TranSynd 668 Allison 2021 Updated SPEC CASE"
brand: "castrol"
price: "HK$3389"
currency: HKD
in_stock: true
reviews_count: 5
category: "Castrol"
url: https://www.desertcart.hk/products/769681198-castrol-transynd-668-allison-2021-updated-spec-case
store_origin: HK
region: Hong Kong
---

# Superior thermal & oxidative stability Extended gear protection Enhanced anti-shudder & clutch durability Castrol TranSynd 668 Allison 2021 Updated SPEC CASE

**Brand:** castrol
**Price:** HK$3389
**Availability:** ✅ In Stock

## Summary

> 🛠️ Drive with confidence—Castrol TranSynd 668 keeps your Allison transmission flawless!

## Quick Answers

- **What is this?** Castrol TranSynd 668 Allison 2021 Updated SPEC CASE by castrol
- **How much does it cost?** HK$3389 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/769681198-castrol-transynd-668-allison-2021-updated-spec-case)

## 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

- • **Clutch Longevity Boost:** Maximize clutch friction life with advanced synthetic formulation 🛡️
- • **Unmatched Gear Defense:** Protect your transmission with industry-leading gear wear resistance ⚙️
- • **Stay Smooth, No Shudder:** Experience extended anti-shudder durability for seamless driving 🛡️
- • **Corrosion & Foam Fighter:** Keep your transmission pristine with excellent corrosion and foaming resistance ⚙️
- • **Thermal Stability Mastery:** Prevents oil thickening and deposits even under extreme heat 🔥

## Overview

Castrol TranSynd 668 is a premium full-synthetic automatic transmission fluid engineered specifically for Allison on-highway transmissions. It meets the TES 668 specification, offering superior gear protection, extended anti-shudder and clutch durability, and excellent resistance to corrosion, foaming, thermal breakdown, and oxidation. Fully backwards compatible with TES 295, this fluid ensures optimal transmission performance and longevity under demanding conditions.

## Description

Castrol TranSynd 668 is a premium, full-synthetic automatic transmission fluid specifically formulated for Allison Transmission on-highway automatic transmissions. TranSynd 668 provides oxidative stability, anti-wear performance, and friction durability, as well as TES 668 specification differentiators such as extended anti-shudder durability and extended clutch friction durability. This fluid features an Allison TES 668 approval. The TES 668 spec is fully backwards compatible for TES 295 applications.

Review: Highly recommend Fully Synthetic oil - Perfect for my Allison 5 split
Review: Good deal - Just what I needed. Good price and fast shipping

## 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B095SYBWQZ |
| Brand | Castrol |
| Brand Name | Castrol |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 340 Reviews |
| Item Form | Liquid |
| Liquid Volume | 384 Fluid Ounces |
| Liquid volume | 384 Fluid Ounces |
| Manufacturer | CASTROL |
| Material | Synthetic |
| Number of Items | 3 |
| Package information | Bottle |
| Part Number | TES668 |
| Recommended Uses For Product | Automotive |
| Recommended uses for product | Automotive |
| SAE J300 Viscosity Grade | 10W |
| Specific Uses For Product | Maintaining and improving the performance of Allison Transmission on-highway automatic transmissions, protecting gears, and preventing corrosion in transit vehicles |
| UPC | 079191219164 |
| Unit Count | 384 Milliliters |
| Viscosity | 10w |

## Product Details

- **Brand:** Castrol
- **Liquid Volume:** 384 Fluid Ounces
- **Material:** Synthetic
- **Package Information:** Jug
- **Recommended Uses For Product:** Automotive

## Images

![Castrol TranSynd 668 Allison 2021 Updated SPEC CASE - Image 1](https://m.media-amazon.com/images/I/41E5MyHmFqS.jpg)
![Castrol TranSynd 668 Allison 2021 Updated SPEC CASE - Image 2](https://m.media-amazon.com/images/I/510jQvr1cIS.jpg)
![Castrol TranSynd 668 Allison 2021 Updated SPEC CASE - Image 3](https://m.media-amazon.com/images/I/51fS+M5Xa4S.jpg)
![Castrol TranSynd 668 Allison 2021 Updated SPEC CASE - Image 4](https://m.media-amazon.com/images/I/51ZQ2Q2uaES.jpg)

## Questions & Answers

**Q: Just to be sure this is for 3 gals?**
A: Yes there were 3 gallons in the case that I bought

## Customer Reviews

### ⭐⭐⭐⭐⭐ Highly recommend Fully Synthetic oil
*by W***E on 19 May 2026*

Perfect for my Allison 5 split

### ⭐⭐⭐⭐⭐ Good deal
*by K***S on 12 May 2026*

Just what I needed. Good price and fast shipping

### ⭐⭐⭐⭐⭐ Great great
*by T***S on 7 May 2026*

👍🤠

## Frequently Bought Together

- Castrol TranSynd 668 Allison 2021 Updated SPEC CASE
- Allison Filter Kit - 29539579 Screw-on Filter with Magnet - Entire kit for replacing filter on Alison transmission per OEM Specs. True OEM Filter!
- GM Transmission Fluid Pan Gasket for 2020-2021 Freightliner MT45 - 29549684

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**Shop now:** [https://www.desertcart.hk/products/769681198-castrol-transynd-668-allison-2021-updated-spec-case](https://www.desertcart.hk/products/769681198-castrol-transynd-668-allison-2021-updated-spec-case)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-07-05*