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Discussion Starter #1
Whilst there will be a number who swear by only ever using top grade diesel in their beast I am prepared to shop around and mix it up a bit. But, and its a big but, I have heard that the supermarket mix (fuel not music!) that is often tagged as city diesel etc and is a mix including bio products can be corrosively damaging in the long term as far as injectors are concerned. Now I have no evidence - so does anone else either good or bad? I was told by a fellow owner that there may be a risk of problems when a higher bio proportion could lead to injector corrosion? I guess with such tight tolerance items as these the design assumptions about the fuel composition is fundamental for long term performance of the component?

My experience so far is mixed and maybe even subconsious! Better fuel must equate to better performance! And who would think that running round on derv and recycled chip fat or yellow flowers could do any good. But at least the car does not smell like a chippy!

And the car: '57 34k miles 210 2.4jtdm F1 remapped, dpf removed & egr chipped out courtesy of NJS Pershore. Use Millers most the time. Goes like s*** off a shovel, no hesitation, high mpg; pulls in 6th from 1500 but 3rd/4th gear most fun, no judder, no smoke. Short commute in week but excuse to do 3 miles on bypass with excuse for big bursts of accelaration past the Audis and BMWs!!
 

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I work on aircraft jet engines and every engine that comes into our workshop we drain off at least 15 litres of fuel which is basicly kerosene,it goes to waste but a few guys use it mixed 50/50 with cooking oil in older diesel cars one of which is an old 156 jtd and landrovers, I've not heard of any problems, I have woundered about trying it but for the low mileages I do I dont think its worth the risk of damage.
 

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On a slightly differant theme I have a mate who runs a fleet of vw diesels and he uses a 1% mix of acetone and 300ml of 2 stroke oil in a tank of fuel and finds they run a lot smoother and better on fuel by about 5 mpg, apparently the acetone breaks down the surface tension of the fuel allowing it to atomise better and the oil replaces the lost lubricating qualities of the modern low sulpher diesel
 

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Discussion Starter #4
Thanks Jon - interesting combination - sounds like a capable chemist or fuels specialist at work here. I'll stick to millers!
 

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As far as I recall City Diesel is (was) a mineral based fuel with reduced sulphur content. Good for the environment, but has a slightly lower energy content so you tend use more of it.

I don't think you can buy the original higher sulphur content fuel in the UK any more and, as I understand it, most of the stuff from the forecourt has a certain amount of biodiesel (usually around 5%) blended in for a good measure. The general advice is that newer common rail systems (i.e. Fiat group JTD engines) should not be run on anything other than very high quality biodiesel. There is a lot of advice here that seems sound, although I couldn't honestly say if it's true:

Diesel Bob Tuning - Vegetable Bob
 

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When i bought my 159 I would pretty much religiously fill up at my local ESSO.
6 months on and I started using MORRISONS as it was more convenient. It was only THEN when i had noticable REGENS/DPF issues and my EGR died on me. I then switched back to ESSO or other non-supermarket brands and have had no issues.

Again, as people said, it could be psychological. But I won't go near Morrisons again. Never thought it gave me as much MPG either.
 

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i worked for a main dealer and now work for autolusso bournemouth.Whilst working at the main dealer i came across loads of issues caused by the use of bio diesel which include

Injector failure very common
Sticky valves
egr failure
dpf failure
diesel pump failure

Bio diesel should never be put in an high pressure diesel system as it leaves a residue which causes failures of the seals in the parts mentioned.The best diesel to use is the high performance diesel its more expensive but increases mpg and fuel system life.It will also reduce smoke and egr problems
 

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During one of my many visits to the dealer earlier this year I saw flyers & posters all over the place warning customers that if they used Morrisons diesel that any warranty work for the parts that srsgrandmaster lists may not be honoured due to them (Morrisons) using a higher percentage of bio in their diesel. This level of bio was not recommended in the jtdm engines.

I would never ever use their fuel based on this alone and would like to extend the warning to other owners.
 

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bio diesel is not healthy for common rail engines and as said above it will corrode the injectors. although iv run my car on asda diesel since iv had it as my local non supermarket fuel is about 6p a litre more, and iv not had a single fuelling problem, does a regen every 7-800 miles, egr is fine, although i have cleaned it out once and put the restrictive gasket in.

i may be tempting fate by saying this but...........................
 

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Discussion Starter #11
given the comments about common rail engines, which are not uncommon, and i understand the issue may be the fine tolerances that could be eroded using this sort of mix I do wonder why the industry is so quiet about it. Could it be that it just increases the revenue gained from the motorist to the overall industry eg put unsuitable fuel in and increase the risk of having to replace components: ££££s. Maybe I'm just cynical in my increasing age ( or is that increasing real life experience?)
 
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