--- product_id: 321925241 title: "Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal" brand: "castrol" price: "1026 kr" currency: DKK in_stock: true reviews_count: 13 category: "Castrol" url: https://www.desertcart.dk/products/321925241-castrol-transynd-668-synthetic-automatic-transmission-fluid-1-gal store_origin: DK region: Denmark --- # Superior thermal & oxidative stability Universal fit for all transmissions Extended anti-shudder & clutch protection Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal **Brand:** castrol **Price:** 1026 kr **Availability:** ✅ In Stock ## Summary > 🛠️ Drive smarter, shift smoother — the synthetic edge your transmission deserves! ## Quick Answers - **What is this?** Castrol TranSynd 668 Synthetic Automatic Transmission Fluid, 1 gal by castrol - **How much does it cost?** 1026 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/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? Bring it on:** Outstanding thermal and oxidative stability prevents deposits and oil thickening, ensuring peak performance. - • **Stay shudder-free:** Extended anti-shudder durability keeps your ride silky smooth under pressure. - • **Gear up with confidence:** Delivers enhanced gear protection for smoother shifts and longer transmission life. - • **Clutch longevity unlocked:** Prolonged clutch-friction durability means fewer replacements and more drive time. - • **Corrosion? Not on our watch:** Excellent corrosion and foaming resistance protects your transmission from wear and tear. ## Overview Castrol TranSynd 668 is a premium synthetic automatic transmission fluid designed for universal fit, delivering superior gear protection, extended anti-shudder and clutch durability, plus excellent resistance to corrosion, foaming, and thermal breakdown. Trusted by thousands with a 4.8-star rating, it ensures your transmission runs cooler, cleaner, and longer. ## 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 | #5,119 in Automotive ( See Top 100 in Automotive ) #20 in Transmission Fluids | | Brand | Castrol | | Brand Name | Castrol | | Container Type | Bottle | | Customer Reviews | 4.8 out of 5 stars 1,070 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 price, fast delivery *by R***1 on September 9, 2026* As expected, we'll packaged. ## 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 --- ## 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.dk/products/321925241-castrol-transynd-668-synthetic-automatic-transmission-fluid-1-gal](https://www.desertcart.dk/products/321925241-castrol-transynd-668-synthetic-automatic-transmission-fluid-1-gal) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-09-15*