ECO DRIVE CERTIFIED - Cut down carbon monoxide and hydrocarbon emissions by 20%, making your diesel ride greener.
TURBOCHARGE YOUR DRIVE - Experience sharper throttle response and smoother acceleration with enhanced combustion.
ENGINE LONGEVITY BOOSTER - Protect and clean fuel injectors to prevent clogging and corrosion for lasting engine health.
FUEL SMARTER NOT HARDER - Reduce fuel costs by up to 10% through advanced injector cleaning and optimized fuel burn.
UNIVERSAL DIESEL COMPATIBILITY - Safe for all diesel engines and after-treatment systems, including DPF and catalytic converters.
Wynn's High-Performance Diesel Fuel System Treatment (500ml) is a premium additive designed to improve combustion efficiency, reduce fuel consumption, and lower harmful emissions. Compatible with all diesel engines and after-treatment systems, it cleans and protects fuel injectors, ensuring smoother acceleration, quieter operation, and prolonged engine life.
Specifications
Manufacturer
Wynn Oil UK
Brand
Wynn's
Model
Wynn's 76401, Formula Gold Diesel System Treatment, 500 ml
Product Dimensions
4.9 x 8.8 x 25.6 cm; 0.5 g
Batteries
Lithium Ion batteries required.
Item model number
76401
Manufacturer part number
76401
Have a Question? See What Others Asked
Will this also clean the turbo?
On how much fuel would you use this and how often would you use it?
Hi, Can you/should you use premium diesel with this or standard diesel?
Should I put it in before filling the tank up or after?
Reviews
4.6
All from verified purchases
R**Y
Good product.
Good product. Use it with a full tank of fuel every time since I only drive local.
A**D
2008 car - injector clean up.
Dont usually write reviews. Was having problems with the engine management light coming on every time we'd drive anywhere. This was happening over a period of about 6 months and progressively getting more frequent.Tried other products to no avail. Ended up taking the car 3 times to different garages to get the codes read and get advice. Eventually found the problem to be "fuel rail pressure" related. The car did actually cut-out on us whist away on holiday.I Was about to book the car in for full diagnosis and most likely new injectors which could have cost £500+. Thought id try some of this as a last ditch money saving effort on an older car.Put 3/4 of this into just over half tank of fuel. Engine light came on during the first 20 seconds of the first journey (normal at this point). Restarted the car and it hasnt been back on since. This was nearly 4 weeks ago.The cars running noticeably smoother (it was rev hunting before and felt down on power and mpg) this has fixed all those problems pretty much instantly.If you have a fuel system issue id recommend giving this a go. Certainly worked for us. I will be buying again soon as a preventative measure.
C**K
Wynns Gold additive treatment! Good results
Wynns gold additive, so I researched into various products makes etc, on various sites, decided on Wynns taking into consideration feedback, reviews and cost. The results where noticeable in just a week, engine sounded smoother, the engine reaction improved, I could feel difference in both engine and driving, after 3 weeks saw good increase in mph too, I used both petrol and diesel version, petrol change in engine most noticeable, where as diesel engine improved but in sense of less smoke, better mph. Would highly recommend both, as they clearly improved my cars.
C**R
Simply the best
I had major problems with chronically poor acceleration in my T180 Toyota Avensis after filling up a few times at the local Texaco station, and another Wynns diesel cleaner hadn't helped much. After reading the reviews, I gave it a go, and the difference was dramatic after it had a while to work through the system. Since then, I have stuck with BP diesel and no further problems; however, I still run this through once every six months or so.It's very easy to use; just pour it in the fuel tank, preferably when less than half full, and drive it normally until you need to fill up again. This is a quality product that can save a fortune at the garage and functions perfectly. My car is 19 years old, but after using this, it drives like a dream for a few months. There is a bit of a smell when putting it in the tank, and I make sure to be careful with the handling, then wash my hands immediately afterwards.
P**I
Ok
Ok
A**R
Quieter and improved starting
Noticed a difference in starting and also after adding and covering 100 or so miles had a load of smoke from the exhaust as if it was cleaning my injectors/valves/DPF.Van seems to be running smoother than it was prior to using this additive.
W**N
Meh!
I have an intermittent injector related problem with slight shunting at low speeds & an occasional turbo overboost condition in my Seat Leon 2.0tdi. Not bad enough to spend many hundreds on repairing, but enough to be pretty annoying. Especially as the turbo usually turns itself off whilst going up hills on the motorway, and I go from 70mph to 50mph pretty rapidly!I previously found the Wynns turbo diesel cleaner very effective (but lasting only a tank or two's time) with the latter issue, so I thought I'd try this product for the former one. But I can't say it made much, if any, noticeable difference. Premium diesel from the filling station seemed to do better.Over time I've tried a number of different brands, like Redex, Comma & Forte, but recently I discovered Liquimoly Super Diesel additive & that's worked out better for me. Not sure why, as they're all just cetane boosters, but my injector issue has definitely smoothed out. For now at least!
C**L
Got rid of issue
Well kind of.My hdi was smoking a fair bit under acceleration. Tried redex. And still same.Got this and seems much better.Not as much smoke coming from exhaust.I also cleaned the sensors front he air intake which helped as well.Orignailly bought from halfrauds.But bought 2 off here after seeing initial results. Worth it
Common Questions
Trustpilot
TrustScore 4.5 | 7,300+ reviews
Ali H.
Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.
1 day ago
Meera L.
Smooth transaction and product arrived in perfect condition.
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This was happening over a period of about 6 months and progressively getting more frequent.Tried other products to no avail. Ended up taking the car 3 times to different garages to get the codes read and get advice. Eventually found the problem to be \"fuel rail pressure\" related. The car did actually cut-out on us whist away on holiday.I Was about to book the car in for full diagnosis and most likely new injectors which could have cost £500+. Thought id try some of this as a last ditch money saving effort on an older car.Put 3/4 of this into just over half tank of fuel. Engine light came on during the first 20 seconds of the first journey (normal at this point). Restarted the car and it hasnt been back on since. This was nearly 4 weeks ago.The cars running noticeably smoother (it was rev hunting before and felt down on power and mpg) this has fixed all those problems pretty much instantly.If you have a fuel system issue id recommend giving this a go. Certainly worked for us. I will be buying again soon as a preventative measure."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"4.0"},"author":{"@type":"Person","name":"C***K"},"datePublished":"31 December 2020","name":"Wynns Gold additive treatment! Good results","reviewBody":"Wynns gold additive, so I researched into various products makes etc, on various sites, decided on Wynns taking into consideration feedback, reviews and cost. The results where noticeable in just a week, engine sounded smoother, the engine reaction improved, I could feel difference in both engine and driving, after 3 weeks saw good increase in mph too, I used both petrol and diesel version, petrol change in engine most noticeable, where as diesel engine improved but in sense of less smoke, better mph. Would highly recommend both, as they clearly improved my cars."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"C***R"},"datePublished":"2 May 2025","name":"Simply the best","reviewBody":"I had major problems with chronically poor acceleration in my T180 Toyota Avensis after filling up a few times at the local Texaco station, and another Wynns diesel cleaner hadn't helped much. After reading the reviews, I gave it a go, and the difference was dramatic after it had a while to work through the system. Since then, I have stuck with BP diesel and no further problems; however, I still run this through once every six months or so.It's very easy to use; just pour it in the fuel tank, preferably when less than half full, and drive it normally until you need to fill up again. This is a quality product that can save a fortune at the garage and functions perfectly. My car is 19 years old, but after using this, it drives like a dream for a few months. There is a bit of a smell when putting it in the tank, and I make sure to be careful with the handling, then wash my hands immediately afterwards."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"P***I"},"datePublished":"19 April 2025","name":"Ok","reviewBody":"Ok"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"A***R"},"datePublished":"3 November 2024","name":"Quieter and improved starting","reviewBody":"Noticed a difference in starting and also after adding and covering 100 or so miles had a load of smoke from the exhaust as if it was cleaning my injectors/valves/DPF.Van seems to be running smoother than it was prior to using this additive."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"3.0"},"author":{"@type":"Person","name":"W***N"},"datePublished":"24 October 2024","name":"Meh!","reviewBody":"I have an intermittent injector related problem with slight shunting at low speeds & an occasional turbo overboost condition in my Seat Leon 2.0tdi. Not bad enough to spend many hundreds on repairing, but enough to be pretty annoying. Especially as the turbo usually turns itself off whilst going up hills on the motorway, and I go from 70mph to 50mph pretty rapidly!I previously found the Wynns turbo diesel cleaner very effective (but lasting only a tank or two's time) with the latter issue, so I thought I'd try this product for the former one. But I can't say it made much, if any, noticeable difference. Premium diesel from the filling station seemed to do better.Over time I've tried a number of different brands, like Redex, Comma & Forte, but recently I discovered Liquimoly Super Diesel additive & that's worked out better for me. Not sure why, as they're all just cetane boosters, but my injector issue has definitely smoothed out. For now at least!"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"C***L"},"datePublished":"14 September 2024","name":"Got rid of issue","reviewBody":"Well kind of.My hdi was smoking a fair bit under acceleration. Tried redex. And still same.Got this and seems much better.Not as much smoke coming from exhaust.I also cleaned the sensors front he air intake which helped as well.Orignailly bought from halfrauds.But bought 2 off here after seeing initial results. Worth it"}],"aggregateRating":{"@type":"AggregateRating","ratingValue":4.625,"bestRating":5,"ratingCount":8}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Will this also clean the turbo?","acceptedAnswer":{"@type":"Answer","text":"Phil Cannings is wrong, the turbo spins up using exhaust gases. It then compresses air from the intake. So it will have some cleaning effect on the exhaust part."}},{"@type":"Question","name":"On how much fuel would you use this and how often would you use it?","acceptedAnswer":{"@type":"Answer","text":"Put this in on an empty tank, fill tank to the top. Use every 3000 miles. Hope this helps"}},{"@type":"Question","name":"Hi, Can you/should you use premium diesel with this or standard diesel?","acceptedAnswer":{"@type":"Answer","text":"I’ve been using this product for a couple of years and I also use premium diesel. \n\nI generally use it about every 3 to 4 full tanks of fuel, especially when I am doing a long run, I find my fuel consumption reduces considerably as the additional cleaning agents work their magic. \n\nPersonally I would highly recommend, premium diesel does have cleaning agents but this just gives the injectors etc that extra wash and brush up."}},{"@type":"Question","name":"Should I put it in before filling the tank up or after?","acceptedAnswer":{"@type":"Answer","text":"Put the additive in the tank prior to completely filling up, let’s say when your around a quarter of a tank. I tend to use it when I am going to be doing a nice long ish run, allowing the additive and the fuel mix to work its magic. If I am not doing a long run I tend to use every 3rd full tank, but I always use premium diesel. Hope this helps happy driving"}}]}]}
