--- product_id: 659314820 title: "Ultra 5 in 1 Diesel Fuel System Cleaner 400ml, Enhances Fuel Economy | Restores Power and Protects your Engine, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK" brand: "stp" price: "¥4155" currency: JPY in_stock: true reviews_count: 13 url: https://www.desertcart.jp/products/659314820-ultra-5-in-1-diesel-fuel-system-cleaner-400ml-enhances store_origin: JP region: Japan --- # restores peak engine power boosts fuel economy & cuts emissions 5-in-1 concentrated formula Ultra 5 in 1 Diesel Fuel System Cleaner 400ml, Enhances Fuel Economy | Restores Power and Protects your Engine, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK **Brand:** stp **Price:** ¥4155 **Availability:** ✅ In Stock ## Summary > ⚡ Unlock your diesel engine’s hidden power and efficiency! ## Quick Answers - **What is this?** Ultra 5 in 1 Diesel Fuel System Cleaner 400ml, Enhances Fuel Economy | Restores Power and Protects your Engine, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK by stp - **How much does it cost?** ¥4155 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/659314820-ultra-5-in-1-diesel-fuel-system-cleaner-400ml-enhances) ## Best For - stp enthusiasts ## Why This Product - Trusted stp brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Power Reclaimed:** Eradicates harmful deposits to restore your engine’s original performance and responsiveness. - • **Engine Longevity Guard:** Minimizes friction and corrosion, extending the life of critical engine components. - • **Trusted Legacy Formula:** Backed by 60+ years of STP expertise, favored by pros and DIYers alike. - • **Fuel Efficiency Booster:** Reduces diesel consumption and exhaust emissions for a greener, wallet-friendly ride. - • **All-in-One Engine Savior:** Cleans, conditions, and protects your diesel fuel system in a single 400ml dose. ## Overview STP Ultra 5 in 1 Diesel Fuel System Cleaner is a concentrated 400ml liquid additive designed to clean, restore, and protect diesel engines. It removes deposits, improves fuel economy, reduces emissions, and extends engine life, leveraging over six decades of trusted STP automotive care innovation. ## Description For over 60 years, and for more miles than anyone can count, STP has been one of the most trusted names in automotive care. Car enthusiasts, “Do-it-Yourselfers” and professional racers rely on STP oil additives, fuel additives and brake and power steering fluids to keep their vehicles running better longer Due to 'Long Life' servicing intervals being stretched further, many vehicles face a build up of deposits that could have major implications on engine performance So why Use a Fuel additive? ## Features - What You'll Get - 400 ml Diesel Fuel System Cleaner - Concentrated Cleaning Power - Cleans and conditions the entire fuel delivery system in one tank - Restores Power and Performance - Recovers peak engine performance by removing harmful deposits - Protects Your Engine - Reduces friction and protects key engine parts from wear and corrosion - Reduces Diesel consumption and exhaust emissions - promotes better fuel economy ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B00NC1ER3U | | Best Sellers Rank | 43 in Automotive (See Top 100 in Automotive) 1 in Carburettor Cleaners 2 in Fuel Systems | | Brand Name | STP | | Contains Liquid Contents | Yes | | Customer Reviews | 4.6 4.6 out of 5 stars (3,798) 4.6 out of 5 stars | | Global Trade Identification Number | 05020144800132 | | Included Components | Diesel System Cleaner | | Item Form | Liquid | | Item Type Name | Car Care Ultra Diesel System Cleaner, 5 in 1 Concentrated Cleaning Formula for Diesel Engines, 400 ml | | Item Volume | 400 Millilitres | | Item Weight | 399 g | | Manufacturer | STP | | Model Number | 77400EN | | Number Of Items | 1 | | Part Number | GST77400EN | | Scent | Ketane | | Size | 400 ml (Pack of 1) | | Special Features | Concentrated | | Specific Uses For Product | Engine | | Surface Recommendation | Metal | | Unit Count | 400.0 millilitre | ## Product Details - **Brand:** STP - **Item form:** Liquid - **Item volume:** 400 Millilitres - **Item weight:** 0.88 Pounds - **Number of items:** 1 - **Scent:** Ketane - **Special feature:** Concentrated - **Specific uses for product:** Engine - **Surface recommendation:** Metal - **Unit count:** 400.0 millilitre ## Images ![Ultra 5 in 1 Diesel Fuel System Cleaner 400ml, Enhances Fuel Economy | Restores Power and Protects your Engine, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK - Image 1](https://m.media-amazon.com/images/I/61LI+B+kwwL.jpg) ## Available Options This product comes in different **Style Name** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Essential for My Tuning Business – Keeps Diesel Engines Running Smooth *by on Reviewed in the United Kingdom 7 December 2025* I’ve been using the STP Ultra 5 in 1 Diesel Fuel System Cleaner in my car tuning and workshop business for a while now, and it’s been fantastic. I use it on everything from standard diesel vehicles to high-performance tuning projects, and it consistently delivers excellent results.This cleaner tackles multiple issues at once — it cleans injectors, removes carbon deposits, prevents corrosion, and improves overall fuel efficiency. I’ve noticed smoother running engines, reduced smoke, and more responsive performance after use. It’s also incredibly easy to use and works with every diesel vehicle I’ve tested.Compared to other fuel additives I’ve tried, this one really stands out for its reliability and effectiveness. It’s a small investment that pays off in better engine performance, longevity, and fewer maintenance issues.For any professional working with diesel vehicles — whether in tuning, repairs, or general maintenance — the STP Ultra 5 in 1 Diesel Fuel System Cleaner is an absolute ### ⭐⭐⭐⭐⭐ A rapid marked difference. *by on Reviewed in the United Kingdom 10 June 2026* Used on a 9 year old Mercedes SLC 250d 35k miles. What a marked difference after only 5 miles! Smoother acceleration, particularly noticable at setting off. Much quieter and smoother idle. Feels like a different car. Product is utterly amazing. Throttle response is definately smoother and linear. I will buy again in 4 or 5k. Thank you. ### ⭐⭐⭐⭐ Seems to have fixed a fuel delivery issue. *by on Reviewed in the United Kingdom 13 March 2026* Seems to have fixed 80% of the issue.Car was kangarooing on acceleration. More intermittent now, will continue to use. ## Frequently Bought Together - STP Ultra 5 in 1 Diesel Fuel System Cleaner 400ml , Restores Power and Protects your Engine, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK - STP Diesel Particulate Filter Cleaner 200 ml, Cleans and Protects Your Filter by Removing Soot in One Treatment, Restores Power and Acceleration, Mechanical Car Cleaning Products, Made in the UK - STP Diesel High Milage Injector Cleaner 200 ml, Cleans and Protects your Engine for 300 miles, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK --- ## 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.jp/products/659314820-ultra-5-in-1-diesel-fuel-system-cleaner-400ml-enhances](https://www.desertcart.jp/products/659314820-ultra-5-in-1-diesel-fuel-system-cleaner-400ml-enhances) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-21*