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24th August 2011, 00:45
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#1
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Saxperience Forum Bum
Join Date: Jan 2010
Location: Abercynon, South Wales
Posts: 2,511
Car(s): 2008 Audi A3 2.0TDI
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Supermarket fuel?
As some may know, my a3 went into an Audi VW specialist in cardiff, with a suspected blown turbo at 45k.
It came back out, with a new air intake pipe, (the large plastic one at the top) Before it went in, it sounded like a police siren, and loss of power. It came out, the main mechanic told he took of the turbo and inspected it, he said theres nothing wrong with it, showed me a graph of my car on boost, everything is normal. He said these turbos can make a bit of noise after being mapped. But i still wasnt convinced this amount of noise is normal even if the turbo fine, its amost like its struggling.
Now it sounds not as bad as it went it, but still doesn't sound 100%, and the fiance whilst driving behind me this morning noticed alot of white smoke, so i phoned up the guy, and told him, he did say when i pulled off from him that he noticed some aswell, but thought it was because the turbo has been on and off the car. But went onto say if i use supermarket, I said yes as its cheaper and on the way to work so quicker to me!
He said the supermarket fuel may be causing the white smoke as its not burning correctly in the engine, as maybe causing the turbo to sound like its struggling, as the siren noise is worst when the car has turbo lag.
As i only have less than quarter of a tank, i will run this theory, what do you think?
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24th August 2011, 00:51
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#2
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Saxperience Forum Bum
Join Date: Mar 2008
Location: Cornwall
Posts: 4,393
Car(s): ZS
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Edit:
REMOVED EPIC FAIL 
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Zetec S - Sea Grey
Last edited by Rogue_Shadow; 24th August 2011 at 00:55.
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24th August 2011, 00:52
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#3
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Saxperience Forum Bum
Join Date: Jan 2010
Location: Abercynon, South Wales
Posts: 2,511
Car(s): 2008 Audi A3 2.0TDI
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Its a diesel!
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24th August 2011, 00:54
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#4
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Saxperience Forum Bum
Join Date: Mar 2008
Location: Cornwall
Posts: 4,393
Car(s): ZS
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Quote:
Originally Posted by timmythechef
Its a diesel!
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ROFL ... I fail
so sorry bud.
I'll sign out
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Zetec S - Sea Grey
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24th August 2011, 00:57
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#5
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Saxperience Forum Bum
Join Date: Jan 2010
Location: Abercynon, South Wales
Posts: 2,511
Car(s): 2008 Audi A3 2.0TDI
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I was thinking then, its fine! 
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24th August 2011, 00:57
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#6
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Frequent Poster
Join Date: Mar 2011
Location: North East
Posts: 743
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24th August 2011, 01:03
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#7
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Saxperience Forum Bum
Join Date: Jan 2010
Location: Abercynon, South Wales
Posts: 2,511
Car(s): 2008 Audi A3 2.0TDI
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Quote:
Originally Posted by cyne
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Thats bollocks tbh, my bosses m3 isnt the same on tesco's super unleaded as it is on others tbh.
Forgot to say, I noticed V Power diesel the other day
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24th August 2011, 01:13
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#8
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Frequent Poster
Join Date: Mar 2011
Location: North East
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Quote:
Originally Posted by timmythechef
Thats bollocks tbh, my bosses m3 isnt the same on tesco's super unleaded as it is on others tbh.
Forgot to say, I noticed V Power diesel the other day
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If you say so.
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24th August 2011, 01:25
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#9
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Established Member
Join Date: Sep 2008
Location: Torbay
Posts: 1,565
Car(s): 2000 phase 2 Saxo VTS Turbo 2000 Nissan 200sx S14a
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supermarkets don't have their own refinery. They get it from the same refinery as normal garages.
I had a chat years ago with a hgv tanker driver when I worked at Morrisons, I too thought supermarket fuel was inferior and he said the tankers were filled with the same fuel that went into the branded fuel stations' tankers.
When it comes to high performance cars, fuel is more of an issue with the octane rating ie shell v power being regarded as the best.
Some people dismiss supermarket fuel as being inferior but in reality how can it be? The majority of the public run their cars on supermarket fuel problem free, if it really was harmful for your car do you not think they would be prevented from selling it and/or manufacturers would advise against using the supermarket fuel?
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24th August 2011, 01:27
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#10
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Saxperience Forum Bum
Join Date: Jan 2010
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Car(s): 2008 Audi A3 2.0TDI
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24th August 2011, 01:29
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#11
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Saxperience Forum Bum
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Quote:
Originally Posted by maddison_vts
supermarkets don't have their own refinery. They get it from the same refinery as normal garages.
I had a chat years ago with a hgv tanker driver when I worked at Morrisons, I too thought supermarket fuel was inferior and he said the tankers were filled with the same fuel that went into the branded fuel stations' tankers.
When it comes to high performance cars, fuel is more of an issue with the octane rating ie shell v power being regarded as the best.
Some people dismiss supermarket fuel as being inferior but in reality how can it be? The majority of the public run their cars on supermarket fuel problem free, if it really was harmful for your car do you not think they would be prevented from selling it and/or manufacturers would advise against using the supermarket fuel?
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Thats true, so could this be just because its a bad batch?
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24th August 2011, 09:10
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#12
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Established Member
Join Date: Dec 2009
Location: greendale
Posts: 1,476
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I'll tell you what i used to fill up at tesco and get 500 miles to a tank, i now fill up at shell and get 550 work that out not changed my driving style or anything imo just proves they must mix the fuel up abit with inferior products i think
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24th August 2011, 09:23
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#13
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Saxperience Hardcore!
Join Date: Oct 2008
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Car(s): VTR Turbo, 106 xsi track slag, Transit recovery, B
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my vtr when was on 10psi ran really badly with notable power loss pointed out on dyno when i got caught short and filled up with sainsburys regular from BP regular, now on v power the difference speaks for itself
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24th August 2011, 09:56
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#14
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Saxperience Post Whore
Join Date: Mar 2003
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White smoke is water vapour, if it was unburnt fuel it would be black!
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Stu QIf in doubt, just repeat the answer to the question....
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24th August 2011, 10:09
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#15
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Saxperience Forum Bum
Join Date: Jan 2010
Location: Abercynon, South Wales
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Car(s): 2008 Audi A3 2.0TDI
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Yes, firstly in a diesel, yes unburnt diesel is black soot, i still get that, thats normal.
Postd the same thread on audi sport, they have a different view on supermarket fuel, yes they share fuel in remote area to save costs, but a supermarket them certainly seem to think they wouldnt share the same fuel as bp, shell etc.
I personally think supermarket fuel is inferior.
the main thing audi sport say about the white smoke, is to check the coolant, coolant is fine.
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24th August 2011, 10:18
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#16
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Saxperience Addict
Join Date: Dec 2009
Posts: 11,712
Car(s): A6 Le Mans tuned/A3 TFSI tuned
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I gave up on supermarket fuel ages ago, false economy. Filled up once at tescos and the EML light came up while the car started choking up. The bottom lambda sensor had a ton of black gunk on it, fuck knows what stayed inside of my brand new cat converter. Not impressed.
Water and some other crap in there, I don't pay 135.9+ for that shit. Once I filled all the way up at sainsburys, about 42 liters. Did two miles and almost a quarter of the tank vanished. Diagnosis: petrol expands when heated. They won't have another penny from me again. And yes, better mpg from real brads, work that one out.
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24th August 2011, 10:26
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#17
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Saxperience Forum Bum
Join Date: Jan 2010
Location: Abercynon, South Wales
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Car(s): 2008 Audi A3 2.0TDI
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I totally agree!
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24th August 2011, 12:02
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#18
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Frequent Poster
Join Date: Mar 2011
Location: North East
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Quote:
Originally Posted by timmythechef
Thats true, so could this be just because its a bad batch?
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I just posted a link that stated exactly what he has said and you just said it was bollocks and now your saying it's true? 
I think though unleaded has to have at least a 95 octane rating, meaning it could be more in the non supermarket stations. Same goes for super unleaded but it has to have at least a 97 octane rating, I think Shell's is supposed to 98. So in theory it could be inferior in some parts if there is more than one refinery.
However we are talking about petrol here, don't think it really matters what you put in a diesel tbh, it will run. You might notice a difference using Shell's diesel v-power so no harm in trying really or as you said it could be a bad batch of fuel.
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24th August 2011, 12:28
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#19
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Saxperience Addict
Join Date: Sep 2008
Location: Swansea / Chippenham
Posts: 10,872
Car(s): 306 diesel shed
broken vts
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personally I think it's a load of bollocks.
performance vehicles may require a better octane rating but that's about it.
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24th August 2011, 12:40
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#20
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Banned
Join Date: Jul 2007
Posts: 4,328
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I run my v6 on tesco 99run and its fine.
On the rollers its over 20bhp up on standerd power and thats 2different sets and minimal mods
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