--- product_id: 52115979 title: "Castrol 21937 Syntrans B Manual Transmission Fluid 75W, 1 Liter" brand: "castrol" price: "38.73 DT" currency: TND in_stock: false reviews_count: 10 url: https://www.desertcart.tn/products/52115979-castrol-21937-syntrans-b-manual-transmission-fluid-75w-1-liter store_origin: TN region: Tunisia --- # 1L capacity 75W viscosity OEM certified Castrol 21937 Syntrans B Manual Transmission Fluid 75W, 1 Liter **Brand:** castrol **Price:** 38.73 DT **Availability:** ❌ Out of Stock ## Summary > Shift into Excellence! 🚗 ## Quick Answers - **What is this?** Castrol 21937 Syntrans B Manual Transmission Fluid 75W, 1 Liter by castrol - **How much does it cost?** 38.73 DT with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/52115979-castrol-21937-syntrans-b-manual-transmission-fluid-75w-1-liter) ## 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 - • **Smooth Shifting:** Experience seamless gear transitions with advanced lubrication technology. - • **Eco-Conscious Choice:** Meets stringent environmental standards, making it a responsible choice for your vehicle. - • **Precision Engineering:** Crafted by Castrol, a leader in automotive fluids, for unmatched quality. - • **Durability You Can Trust:** Formulated to withstand high-stress conditions, prolonging the life of your transmission. - • **Engineered for Performance:** Designed specifically for manual transmissions, ensuring optimal performance. ## Overview Castrol 21937 Syntrans B Manual Transmission Fluid is a high-performance 75W fluid designed for manual transmissions, offering superior lubrication and protection. With a 1-liter capacity, it is engineered to enhance shifting performance and extend the life of your transmission, all while adhering to eco-friendly standards. ## Description Description: Castrol Syntrans Transaxle 75W-90 is a fully synthetic gearbox oil SAE 75W-90 API GL-4+ forr Transaxle - gearboxes (manual gearboxes and axis drives combined with a common lubrication). Useable in VW gearboxes, which need the specification VW 501.50 Adavantages: An excellent protection against wear and synchronization-performance. Easy shifting also in low temperatures. Very good low temperature-viscosity offers the best protection against wear in lowest temperatures, too. Reduction of the operation temperature leads to a longer lifetime of the gearbox oil and of the gearbox components. Excellent oxidation-stability. Specifications/releases API GL-4+ VW G 052 911/ VW 501 50 ## Features - 29 ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Deutsche Castrol Vertriebsgesellschaft mbH | | Brand | Castrol | | Model | 21937 | | Package Dimensions | 27.2 x 9.2 x 6.4 cm; 920 g | | Item model number | 21937 | | Manufacturer part number | 21937 | | OEM Part Number | 21937 | | Item Weight | 920 g | ## Images ![Castrol 21937 Syntrans B Manual Transmission Fluid 75W, 1 Liter - Image 1](https://m.media-amazon.com/images/I/81matp6GJXL.jpg) ## Questions & Answers **Q: Is it 75w only or 75w 90?** A: This is a straight 75w oil. If you want a Castrol 75w90 gear oil, have a look at Castrol Axle Z Regards Richard ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Notchy feel Shorted *by J***J on Reviewed in the United Kingdom on 22 August 2017* Despite bmw claiming their lifetime oil doesn't need to be changed I decided to change it anyway.My bmw e46 coupe 5speed manual is 15 years old and has done 127000 miles.Rest of the car felt great apart from the gearbox. The only thing wrong was it felt notchy and in the hot weather it was at times difficult to get into gear.Since changing it with this gearbox oil I'm very happy only driven it 11.7miles since changing it to castrol and the gears feel smooth and well lubricated.And goes straight into gear with no notchy feeling to it.The old oil was black and not very much but very tiny metal particles inside it.I used castrol's oil selecter on their website and clicked other products and it Recommended this one. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Smooth and soft shifting *by V***C on Reviewed in the United Kingdom on 8 April 2017* I've order it for my BMW 1er E87 2008. 118d as it is described BMW gearbox oil. The original BMW gearbox oil is too expensive, and I would say that the BMW oil is the same just in different package (not sure). On the gearbox says lifetime oil but it was so black as you can see on the photos. The gear shifts are now smooth and soft. For now I give it 5 stars and hope that the next oil change is going without any prior problem on the gearbox :) ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars superb transmission oil from Castrol !! *by S***N on Reviewed in the United Kingdom on 12 March 2015* Really good quality gearbox oil from Castrol. Makes a difference when changing gears it is really smooth now. Highly recommended product if you own a VAG car, especially if it is a sporty one like mine! --- ## 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/52115979-castrol-21937-syntrans-b-manual-transmission-fluid-75w-1-liter](https://www.desertcart.tn/products/52115979-castrol-21937-syntrans-b-manual-transmission-fluid-75w-1-liter) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-23*