--- product_id: 6914051 title: "Stanadyne Diesel Performance Formula 38566, 64 Ounce" brand: "stanadyne" price: "£52.08" currency: GBP in_stock: true reviews_count: 8 category: "Stanadyne" url: https://www.desertcart.co.uk/products/6914051-stanadyne-diesel-performance-formula-38566-64-ounce store_origin: GB region: United Kingdom --- # Boosts fuel economy by restoring cetane levels Enhances horsepower & torque with advanced detergents OEM-approved for superior engine protection Stanadyne Diesel Performance Formula 38566, 64 Ounce **Brand:** stanadyne **Price:** £52.08 **Availability:** ✅ In Stock ## Summary > ⛽ Power up your diesel, dominate the road with Stanadyne Performance Formula! ## Quick Answers - **What is this?** Stanadyne Diesel Performance Formula 38566, 64 Ounce by stanadyne - **How much does it cost?** £52.08 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/6914051-stanadyne-diesel-performance-formula-38566-64-ounce) ## Best For - stanadyne enthusiasts ## Why This Product - Trusted stanadyne brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Flexible & Safe Dosing:** Compatible with other Stanadyne additives—double dosing won’t harm, just optimize - • **Year-Round Engine Guardian:** Use every season to prevent fuel-related issues and maintain peak performance - • **Proven Cleanliness Standard:** Meets Cummins L10 Superior Test to keep your fuel system spotless - • **Trusted by Industry Leaders:** OEM approvals from GM, Ford, Deere & Navistar ensure top-tier reliability - • **Power & Efficiency Amplified:** Restores horsepower and torque while improving fuel economy for a smoother ride ## Overview Stanadyne Diesel Performance Formula 38566 is a premium 64-ounce diesel fuel additive designed to enhance engine performance by improving fuel economy, horsepower, and torque. Approved by major OEMs like GM, Ford, Deere, and Navistar, it meets the rigorous Cummins L10 Superior Test for fuel cleanliness. Ideal for year-round use, this additive protects diesel engines from fuel-related problems and is compatible with other Stanadyne products for flexible dosing. ## Description Stanadyne Performance Formula protects your diesel engine and restores engine performance. The detergent and cetane improver in Performance Formula will help restore fuel economy, increase horsepower and torque. Stanadyne Performance Formula 1/2 gallon (64 ounce) jug treats 240 gallons diesel fuel. Note: All Stanadyne Diesel Fuel Additives can be blended with each other and "double-dosing" is not damaging - although it may not provide twice the benefit. Where engine and vehicle OEMs have approved Stanadyne, most of them recommend Performance Formula, which should be used year-round to ensure protection against fuel related problems. Review: Great Product Highly Recommend for Diesel Engines - I use my oil sampling program to test this product.. After using Stanadyne the iron count in my oil sample decreased. To double check it I did not use it for the next oil change cycle and the iron count went back up. I used Stanadyne no treatment to the next oil change cycle and the iron count went back down. Definitely a good product to lubricate your fuel system and reduce wear on your engine Review: Fuel treatment - Works great treating fuel. ## Features - Approved by many OEMs including GM, Ford, Deere & Navistar - Proven to perform best in independent testing - The premium, all-season, all purpose diesel fuel additive, designed to tackle virtually any diesel fuel related problem. - Meets Cummins L10 Superior Test for cleanliness - Made by a fuel injection equipment manufacturer ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000M5QPSY | | Automotive Fit Type | Universal Fit | | Best Sellers Rank | #11,656 in Automotive ( See Top 100 in Automotive ) #24 in Diesel Additives | | Brand | Stanadyne | | Brand Name | Stanadyne | | Compatible with Vehicle Type | Bus, Truck | | Container Type | Can, Jug | | Customer Reviews | 4.8 out of 5 stars 744 Reviews | | Liquid Volume | 64 Fluid Ounces | | Manufacturer | Stanadyne | | Manufacturer Part Number | 38566 | | Model Number | 5 | | Package Information | Can, Jug | | Size | 64oz | | UPC | 753167924442 026508385661 | | Unit Count | 64.0 Fluid Ounces | | Vehicle Service Type | Bus, Truck | ## Product Details - **Brand:** Stanadyne - **Liquid Volume:** 64 Fluid Ounces - **Package Information:** Can, Jug - **UPC:** 753167924442 026508385661 - **Vehicle Service Type:** Bus, Truck ## Images ![Stanadyne Diesel Performance Formula 38566, 64 Ounce - Image 1](https://m.media-amazon.com/images/I/81pv14WSKLL.jpg) ## Questions & Answers **Q: does it contain antigel** A: The performance does have a antigel the winter formula is for extreme cold weather **Q: Is this compatable with def (diesel exhaust fluid) engines. i'm in ca and have a 2011 duromax.** A: Like other popular additives on the market, the use does not have any bearing on the use of DEF as the DEF is part of the "after combustion stage" of any modern pick-up truck diesel engine. Stanadyne additive is one of the better additives with regards to helping to keep the injectors lubricated during use which also helps to keep them clean and therefore greatly aides in cooling the injectors which are the 3 components of any good diesel fuel; Fuel for combustian-Lubrication of pumps & injectors-Cooling of Injectors, therefore, longer life expectancy! The idea of increasing the cetane rating might be true for some of the additives one can buy, but that is really not the reason to buy any diesel additive! DEF is injected after the combustion process and only used to help dissolve and burn out any particulate matter being emitted in the exhaust. **Q: How often do you use it? Is every fill up ok?** A: Yes I use 6oz every fill up it is great for the engine and increases power **Q: What is the dosing ratio of additive to diesel fuel?** A: .26 ounces per gallon of diesel. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great Product Highly Recommend for Diesel Engines *by B***A on April 18, 2026* I use my oil sampling program to test this product.. After using Stanadyne the iron count in my oil sample decreased. To double check it I did not use it for the next oil change cycle and the iron count went back up. I used Stanadyne no treatment to the next oil change cycle and the iron count went back down. Definitely a good product to lubricate your fuel system and reduce wear on your engine ### ⭐⭐⭐⭐⭐ Fuel treatment *by T***M on January 6, 2026* Works great treating fuel. ### ⭐⭐⭐⭐⭐ Great product *by M***B on March 5, 2026* Awesome product. Great price. Use it in my 2018 Duramax. ## Frequently Bought Together - Stanadyne Diesel Performance Formula 38566, 64 Ounce - Stanadyne 38561 Diesel Lubricity Formula, 64 oz - Stanadyne 43566 Performance Formula Injector Cleaner, 32 oz --- ## 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.co.uk/products/6914051-stanadyne-diesel-performance-formula-38566-64-ounce](https://www.desertcart.co.uk/products/6914051-stanadyne-diesel-performance-formula-38566-64-ounce) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-18*