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Discussion Starter · #1 ·
Hi,

I was wondering of anyone uses diesel additives like Red-ex on their Q5 and does it really work or is it just a waste of money?

One of my friends swears by it for winder driving in Scotland but having never used it I do not have an opinion.
 

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Diesel additives are used before due to poor quality diesel and problems in the winter, now is the fuel much better and you do not need additives
For me it was a waste of money
 

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not exactly correct ...all depends were you buy your fuel from, quality various alot. Buy it from fuel specialists like shell etc NOT supermarkets.
 

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I did not know that fuel is sold in supermarkets

The first time I hear something like that
 

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Discussion Starter · #7 ·
Cruiser, if I am using Tesco or Sainsburys Fuel which i think may be esso (based on the tanker that was filling the tanks in the Tesco petrol station) so i use something like redex every few tanks?

I am asking this as my wife sometimes borrows my car and sometimes fills it up at Tesco.

your advice would be appreciated
 

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Hi Romach

Some of the Tesco stations do use esso fuel so you shouldn't have any problems there, tends to be the smaller convenience type stores of petrol stations they have taken over from Esso but apart from those ..supermarket fuels should be avoided at all costs. i myself prefer Shell fuel and as a rule tend to use Vpower once a month, the fuels that good you dont really need to use any additives.

I personally wouldn't use supermarket fuel no matter what the price difference, nearly all fuel related problems that i see originate with poor quality fuel and contamination normally with customers using supermarkets. More than ever Modern diesels with DPFs, EGR and common rail injection etc all require high quality fuel and oils to work as designed.

I've not long returned from a 3 day conference on vehicle technology and predicted future developments, we had a presentation on fuel and the difference in fuel quality between the likes of shell and supermarkets was unbelievable. the amount of difference in levels of bio and ethanol etc was scary. Even the supermarkets performance fuel was just a case of them adding additive !!
Another thing to take into consideration was the actual cost. there is no doubt You will save money when you fill up at a supermarket, however MPG will be affected as you will require more fuel for requested power, when using a quality fuel you will gain power and use less fuel (increase MPG) and hence save money making the 2 virtually the same cost but better for the vehicle components.

i was on a course a few years ago with guys from shells fuel research team and the amount of investment and money they spend just tweaking fuel for our different seasons and to gain mpg and power is scary. Do you think supermarkets invest that sort of money :)

i personally dont rate redex, the chemicals used in the product are too harsh. ive seen lambda contamination from silicones etc
If using any additive i tend to use either Forte or Liqui Moly and have found both to work well.

Hope this helps
 

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Hi,

I was wondering of anyone uses diesel additives like Red-ex on their Q5 and does it really work or is it just a waste of money?

One of my friends swears by it for winder driving in Scotland but having never used it I do not have an opinion.
Diesel Fuel come from the same refinery from the same storage tank for all brands.
The only thing thats differant are the following.
Tanker Driver swipes his card when he starts to fill up this puts the additive pack in the fuel if it has one.
The only differant diesel is Shell V-Power as it has a high GTL mix [Gas to Liquid] so that part is not made from Oil and it has the lowest Soot contant of any Diesel.
Forget Power claims I just stick this in our Diesel Cars and have no issues with DPF Clogging even if driven in Town at low speed for weeks.
Just put V-Power Diesel in your Tank.
 

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Discussion Starter · #10 ·
Thanks guys!

I usually use the Shell garage in corstorphine but MRS uses Tesco and Sainsburys for her Polo and has put Tesco diesel in my car recently so will stick to Shell as it is actually nearer to my house!
 

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Diesel Fuel come from the same refinery from the same storage tank for all brands.
The only thing thats differant are the following.
Tanker Driver swipes his card when he starts to fill up this puts the additive pack in the fuel if it has one.
The only differant diesel is Shell V-Power as it has a high GTL mix [Gas to Liquid] so that part is not made from Oil and it has the lowest Soot contant of any Diesel.
Forget Power claims I just stick this in our Diesel Cars and have no issues with DPF Clogging even if driven in Town at low speed for weeks.
Just put V-Power Diesel in your Tank.
That's V-Power DIESEL, not V-Power Unleaded, in case anyone makes that mistake. Unleaded petrol in VAG Common Rail 'CR' diesel engines is an engine killer! You can get away with it in the PD engines, but not the CR engines
 

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Discussion Starter · #12 ·
LOL


There is a label on the insider of the fuel flap that reminds people what fuel is required and I think the filler car is clearly marked Diesel too!

I have known folk to put the wrong fuel in their cars and luckly I take my time and read the labels on the pumps!

Who would be liable for repairs if the wrong fuel comes out of the pump on a forecourt?

I am not going to be sexist and say it is usually women as that would be very wrong of me
 

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There are so many variables in diesel, during power testing of many large engines we measured the specific gravity a d temperature which was then used on a conversion table to get the heat value which related to power through the brake specific fuel consumption. The biggest change in power is the combustible air temperature lower the better. If the fuel gets too hot you will lose power also, too cold fuel and then you will start waxing of the fuel system hence the use of fuel additives during the winter months. In general purchase the best fuel available, if you look closely at supermarket fuel it will tell you the % of Bio diesel again which is power loss.
The top rated fuel from BP and Shell will not necessary give you more power but may increase the MPG
 

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That's V-Power DIESEL, not V-Power Unleaded, in case anyone makes that mistake. Unleaded petrol in VAG Common Rail 'CR' diesel engines is an engine killer! You can get away with it in the PD engines, but not the CR engines
Misfuelling inhibition for diesel currant models on mine as Standard so no Unleaded may enter.
 

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had a few vehicles in the workshop with misfuelling inhibition and youd be surprised what people can do ...they thought the pump was faulty :)
 

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had a few vehicles in the workshop with misfuelling inhibition and youd be surprised what people can do ...they thought the pump was faulty :)
Best one was a few years ago on the M5 services.
Tanker Driver filled Diesel tank with Petrol cars filled up back on motorway in a Flash up to 70+ BANG and lots of them.
 

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I live in the Chicagoland area and have always had issues when it came to picking/finding a station that sells good quality diesel fuel. During my research i went into several stations and asked them what type of fuel they have. I typically heard B10 or >B10 which could be crap. I have found that the "Delta Sonic" and "Meijer" are the only stations that call out B5 or better on their pumps and their employees are fully aware that they carry a good quality diesel fuel. Meijer happens to be a supermarket.
 
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