--- product_id: 330979480 title: "TranSynd 668 Full-Synthetic Auto Transmission Fluid, 5 Gallon Pail" brand: "castrol" price: "2678.50 DT" currency: TND in_stock: true reviews_count: 8 category: "Castrol" url: https://www.desertcart.tn/products/330979480-transynd-668-full-synthetic-auto-transmission-fluid-5-gallon-pail store_origin: TN region: Tunisia --- # Up to 300,000 miles extended drain interval Full-synthetic formula for peak performance Superior shear stability for lasting gear protection TranSynd 668 Full-Synthetic Auto Transmission Fluid, 5 Gallon Pail **Brand:** castrol **Price:** 2678.50 DT **Availability:** ✅ In Stock ## Summary > ⚙️ Keep your transmission running smoother, longer — because your ride deserves the best. ## Quick Answers - **What is this?** TranSynd 668 Full-Synthetic Auto Transmission Fluid, 5 Gallon Pail by castrol - **How much does it cost?** 2678.50 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/330979480-transynd-668-full-synthetic-auto-transmission-fluid-5-gallon-pail) ## 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 - • **Unmatched Longevity:** Drive longer with up to 12x extended drain intervals vs. conventional fluids - • **Rock-Solid Viscosity:** Maintains stable viscosity to protect gears and clutch under all conditions - • **Tailored for ALLISON:** Precision-engineered to optimize ALLISON transmission performance and durability - • **Anti-Shudder Durability:** Smooth, shudder-free shifts for a premium driving experience - • **Bulk Value & Convenience:** 5-gallon pail ensures you’re stocked and ready, saving time and money ## Overview Castrol TranSynd 668 is a premium full-synthetic automatic transmission fluid designed specifically for ALLISON transmissions. It offers industry-leading extended drain intervals up to 300,000 miles in general-duty use, exceptional shear stability to maintain viscosity, and enhanced gear and clutch protection. Packaged in a convenient 5-gallon pail, it delivers superior performance and value for professional-grade vehicle maintenance. ## Description TranSynd is a full-synthetic, automatic transmission fluid designed specifically for ALLISON transmissions. Review: Great deal. - Good stuff for Allison Transmissions. Convenient to get it in a bulk size, off desertcart of all places. Sale price was good too. Very happy.. Review: Arrived with NO leaks - Much cheaper than buying single gallons of this stuff. Works fine. LLY Duramax. ## 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 | #25,628 in Automotive ( See Top 100 in Automotive ) #85 in Transmission Fluids | | Brand | Castrol | | Brand Name | Castrol | | Container Type | Pail | | Customer Reviews | 4.7 out of 5 stars 333 Reviews | | Global Trade Identification Number | 00079191219638 | | Included Components | Transmission Fluid | | Item Form | Liquid | | Item Weight | 38 pounds | | Liquid Volume | 640 fluid ounces | | Manufacturer | Castrol | | Material | Synthetic | | Model Number | 15E2E0 | | Number of Items | 1 | | Number of Packs | 1 | | Package Information | Pail | | Part Number | 15E2E0 | | Recommended Uses For Product | Automotive | | SAE J300 Viscosity Grade | 5W-40 | | Specific Uses For Product | Specific vehicle and transmission types, enhancing performance and longevity | | UPC | 079191219638 | | Unit Count | 640 Fluid Ounces | ## Product Details - **Brand:** Castrol - **Item Weight:** 38 pounds - **Liquid Volume:** 640 fluid ounces - **Material:** Synthetic - **Package Information:** Pail ## Images ![TranSynd 668 Full-Synthetic Auto 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 ### ⭐⭐⭐⭐⭐ Great deal. *by D***6 on July 26, 2026* Good stuff for Allison Transmissions. Convenient to get it in a bulk size, off Amazon of all places. Sale price was good too. Very happy.. ### ⭐⭐⭐⭐⭐ Arrived with NO leaks *by D***R on August 8, 2026* Much cheaper than buying single gallons of this stuff. Works fine. LLY Duramax. ### ⭐⭐⭐⭐⭐ Check your manual for fluid type, TranSynd isn't for every transmission *by J***K on March 22, 2026* Perfect, Castrol is a quality product and recommend for the Allison 3000 in our 2003 Newmar Diesel pusher. As most all items from Amazon it arrived fast. if your thinking about changing yours, check your manual and make it requires TranSynd, your Allison Transmission will Appreciate it. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/330979480-transynd-668-full-synthetic-auto-transmission-fluid-5-gallon-pail](https://www.desertcart.tn/products/330979480-transynd-668-full-synthetic-auto-transmission-fluid-5-gallon-pail) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-15*