Car enthusiasts of all makes and models will spend their hard-earned cash making their vehicles work to the best of their ability, but most commonly this comes in the form of engine upgrades, chassis improvements and aesthetic changes. However, despite all of these improvements, it may be that the type of fuel that you put in your car could be having a detrimental effect on overall performance. Even if the fuel you put into your car is up to EN590 or EN228 standards, there is the risk that carbon build-up, clogged valves or dirty injectors can cause performance issues over time. That’s where fuel additives come into play. Many claim to provide a whole range of benefits from cleaning internal systems, improving overall performance and fuel economy, lowering emissions and even extending the workable life of your engine. Most additives are simple enough to use, as they are applied directly into the fuel tank, which then mixes with the fuel and works its way through the fuel lines, pump, injectors and into the combustion chamber. To test out how effective fuel additives can be on a performance vehicle, we tested a range of products from Millers Oils on our demo car Penny, a 2008 1.6 Turbo Cooper S, using our in-house dyno.
About Millers Oils EPP Additives
Millers Oils have been producing engine oils, lubricants and performance solutions since 1887, and now cover a whole range of sectors from commercial vehicles, passenger cars, classic cars and motorsport. Their products are designed to ensure that the fuel you put into your car provides the level of performance that it was intended to do, without being impeded by build up in your car’s internal systems. We selected 4 Millers Oil Emission Performance Programme (EPP) products for testing on Penny, to see how the overall performance fared after a thorough cleaning and run out on our dyno. The EPP is designed to provide garages with high-quality treatments to improve the overall performance of vehicles coming into their workshops and help car owners to lower their emissions in order to pass the stricter limits on MOT tests.
Millers Oils Petrol Injector Cleaner
Over time, injector nozzles may become partially blocked, resulting in a loss of fuel economy, risk of increased emissions and carbon deposits build-up. Millers Oils’ Petrol Injector Cleaner is a highly concentrated cleaning solution that aims to remove unwanted deposits from your injection systems and claims to improve torque, resolve engine issues such as stalling or hesitancy and reduce engine emissions. It’s claimed that a single-use can result in up to 98% restoration to acceleration and overall power whilst increasing fuel economy and protecting against corrosion within the fuel system.
Millers Oils Petrol System Clean & Protect
This all in one petrol fuel treatment can be used in all petrol vehicles, with or without PPF (Petrol Particulate Filter). As well as reducing carbon build-up, the product cleans injectors, carburettor jets and inlet valves. The overall result is an engine that performs at a much higher standard, with improved fuel economy, reduced emissions and an overall smoother driver.
Millers Oils PPF Turbo & Exhaust Cleaner
Building on the treatment from the Petrol System Clean & Protect, the PPF Turbo & Exhaust Cleaner provides a more efficient clean for cars with PPF. The main benefit of using this product is that trapped soot particles are removed from the system, as well as continuous cleaning throughout the entire turbo and exhaust system.
Millers Oils Engine Flush
Ideally used before an oil change, the Engine Flush ensures that your engine is fully cleaned before replacing the oil by removing sludge, deposits and other unwanted build-up. The Engine Flush ensures that oil can flow into the most critical parts of the engine by clearing the most common pathways and provides anti-wear protection.
The Test
To carry out our test, we used our in-house dyno to track brake horsepower, torque and compression ratio on Penny, our 2008 1.6 Turbo Cooper S.
Pre-treatment dyno run & compression tests
In order to provide some baseline metrics to see how the additives affect the overall performance, we brought the engine up to speed to test its overall output, before carrying out a compression test.
Add treatments
After our baseline metrics were set, we started the actual treatment of the fuel tank and engine. Starting with Petrol System Clean & Product, Petrol Injector Cleaner and PPF Turbo & Exhaust Cleaner applied directly into the fuel tank. The Engine Flush was then added into the engine, to allow the product to start to take effect. After all of the products had been applied, the car was left to idle to allow the additives to circulate through the system and for the engine flush to have time to permeate as much of the internal components as possible.
Pre-treatment dyno run & Compression tests
Once all of the treatments had taken place and the engine oil changed, we carried out the same tests as before in reverse order to see how effective the additives have been.
The results
After all the tests and treatments, it’s pleasing to see that there were some positive improvements. Overall, the maximum output increased from 228 bhp to 231 bhp, and we saw that torque improved from 345 Nm up to 357 Nm. The Engine Flush seemed to have had a positive effect as well, with the two central cylinders benefiting from an additional 10 psi each.
Book your service
To benefit from Millers Emission Performance Additives, book your service with Lohen. Not only will this help remove contaminants from the engine and ensure your MINI is running at its best, but this service will also clean your injectors, engine, turbo and PPF. What’s even better, is that this whole service only takes around 2 hours to complete, but you can easily restore lost power from an old engine at a very affordable price. To book, get in touch with our team today on 01785 859999 or sales@lohen.co.uk
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from 302 reviews
Fit perfect had no problems with delivery either
Fit perfect had no problems with delivery either, would recommend
Dilan G
09/29/2026
nice piece of kit
nice piece of kit, easy to fit. should increase body stability
JIM
09/28/2026
Nice
Nice product
Anonymous
09/27/2026
Good quality, do the job perfectly
Was rebuilding engine and had lost 2 head exhaust manifold bolts, bought 8, cheap as chips (cheaper in fact😂) but really good quality. I always trust Lohen whether it’s a cold air intake or in this case, some bolts.
George Stewart Bsc
09/26/2026
Hello the team !!!! The product is clean Hope
Hello the team !!!! The product is clean Hope it will be also in performance !!!! i import TRITEC engine new if you are interested price 1500€ Fob France
Anonymous
09/25/2026
No issues fitting the part it was an exact match in size
No issues fitting the part it was an exact match in size, good quality and would recommend
Dilan G
09/23/2026
Clutch
Fits fine. Not tested yet
Brian mcGuinness
09/22/2026
They are extremely
They are extremely good
Anonymous
09/21/2026
Great service easy and quick hassle free
Great service easy and quick hassle free. products have improved my car love the sound
Haff
09/21/2026
Cravenspeed 17% reduced pulley
Quick delivery, easy to fit. Looks and feels quality.
Thanks
Alan Jones
09/16/2026
Best intake for f56
Nick
09/10/2026
A great piece of kit
A great piece of kit. No discernible difference in reception quality and I don’t have to unscrew. The aerial in a car wash!
Tony Taylor
09/05/2026
I can clearly see my oil level now
I can clearly see my oil level now, really struggled with the original one. Excellent
Karen Smith
09/04/2026
Love the shirt
Love the shirt. No one has one over here on the west coast of the States.
Steve Wallin
09/03/2026
Sourced and purchased a high pressure fuel pump from Lohen for our Mini Cooper S
Sourced and purchased a high pressure fuel pump from Lohen for our Mini Cooper S. The local garage in Wales fitted it - at approximately half the price of the original quote. Lohen despatched the part direct to our garage within 24 hrs - great service. (Touch wood the mini is running great again.)
Wish we lived closer but won't hesitate to use Lohen again.