Is posh diesel worth it? (85 Viewers)

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Jane And Rog

LIFE MEMBER
Jan 19, 2019
1,586
9,843
Ashford, Kent
Funster No
58,099
MH
Adria Twin 640 SGX
Exp
A few years
Since the debacle with Denby needing new injectors, DPF and two EGRs I’ve been using posh diesel and adding cleaner when I can’t find that.

Filling up the other day in the UK I did the mental arithmetic and posh diesel costs about £14 extra over a full tank. RedX diesel additive costs £3 for the same tank £6 if you double up.

Is posh diesel from a big refinery actually that much better - or at all than the tiny extra hassle of a bottle of cleaner?
 

Gellyneck

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Jun 5, 2014
10,256
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31,836
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C Class
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More than toes wet now!
Since the debacle with Denby needing new injectors, DPF and two EGRs I’ve been using posh diesel and adding cleaner when I can’t find that.

Filling up the other day in the UK I did the mental arithmetic and posh diesel costs about £14 extra over a full tank. RedX diesel additive costs £3 for the same tank £6 if you double up.

Is posh diesel from a big refinery actually that much better - or at all than the tiny extra hassle of a bottle of cleaner?
Never bought a litre of posh diesel or Redex for either 12 year old car or 11 year motorhome. Nigh on always supermarket fuel.
 
May 28, 2024
725
2,926
Maspalomas, Spain
Funster No
103,439
MH
Giottiline Toscan 74
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2024
Since the debacle with Denby needing new injectors, DPF and two EGRs I’ve been using posh diesel and adding cleaner when I can’t find that.

Filling up the other day in the UK I did the mental arithmetic and posh diesel costs about £14 extra over a full tank. RedX diesel additive costs £3 for the same tank £6 if you double up.

Is posh diesel from a big refinery actually that much better - or at all than the tiny extra hassle of a bottle of cleaner?
I find that 'posh diesel' albeit more expensive, gives better mpg so it cancels out the extra cost. Also, it has cleaners incorporated so you don't need to add any.
 
Mar 22, 2023
710
1,973
New Forest, United Kingdom
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94,759
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N+B Arto 74C
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Since 2005
Since the debacle with Denby needing new injectors, DPF and two EGRs I’ve been using posh diesel and adding cleaner when I can’t find that.

Filling up the other day in the UK I did the mental arithmetic and posh diesel costs about £14 extra over a full tank. RedX diesel additive costs £3 for the same tank £6 if you double up.

Is posh diesel from a big refinery actually that much better - or at all than the tiny extra hassle of a bottle of cleaner?
I doubt it makes a jot of difference, I have run diesels now for over a half million miles and don't get problems using cheap diesel, I would run Red if I could !!
 
Aug 8, 2019
426
622
Chichester
Funster No
63,081
MH
Autosleeper Broadway
Exp
Since 2019
I fill up with it once in a while to help , but I've got a WEX Esso fuel card which gives me 6p a litre discount

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Sep 17, 2017
6,256
11,979
Birmingham, UK
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50,575
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A-Class
Exp
2017
I didn't think it made a difference. I always filled up with the cheapest supermarket stuff I could get.

I was duped into getting a tank of the 'ooh-la-la' Shell stuff. Reset my trip counters.... and got 2mpg more than usual by the next garage stop. Maybe I just had a lot of lucky tailwind? Same again the next tank full. And I lost the improvement after a couple of tanks on the normal plebby stuff. Then it came back when I refilled with Shell v-power again. And I think the engine sound a bit less clattery on the posh stuff too.

Still not enough of an improvement to make economic sense though.
 

Tombola

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Nov 21, 2020
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Rapido 8094DF
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I doubt it makes a jot of difference, I have run diesels now for over a half million miles and don't get problems using cheap diesel, I would run Red if I could !!
You wouldnt have need3d any of the gear soon anyway Mz when you go ev..:LOL:
 
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Jane And Rog

Jane And Rog

LIFE MEMBER
Jan 19, 2019
1,586
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Ashford, Kent
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58,099
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Adria Twin 640 SGX
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A few years
yeah, I’m not sold on the MPG advantage. I just want to avoid having to spend another £7k on Fiat parts when the DPF clogs up.
The strong recommendation when discussing that was “posh diesel or additive” both here and on the Fiat forums.

My hunch is additive is better and cheaper.

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Mar 22, 2023
710
1,973
New Forest, United Kingdom
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N+B Arto 74C
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Since 2005
You wouldnt have need3d any of the gear soon anyway Mz when you go ev..:LOL:
Blimey Tombola you are jumping ahead of the game there !!

The Golf (2006) has to die before an EV comes on our drive, and I have to say that it is resolutely holding out. People talk about cam belt changes, that little Golf does not even get oil changes 165,000 on the clock.
 
Last edited:
Nov 4, 2022
132
490
Hampshire, UK
Funster No
92,251
MH
Weinsberg
Exp
Since 2005
Premium diseasel at Costco is cheaper than supermarket plain around here (17ppl last fill) the difference equates to a 1 litre bottle of Bombay Sapphire gin per tank full. We plan our UK journeys on passing Costco to fill, sad as that sounds.

eg before going to Van Bitz we filled in Reading, on way home from Uphill Marina, brimmed at Avonmouth. Next planned trip away will fill at Coventry on way home. Trip after that Leicester on way home.
 
Aug 18, 2014
24,845
145,269
Lorca,Murcia,Spain
Funster No
32,898
MH
Transit PVC
Exp
16 years since restarting
I have garages around me here in Lorca where posh is one cent dearer than normal .I put in 80 litres the other day as a treat-There is also a Repsol garage not far away where the posh & normal are the same price? Always makes me wonder who puts the normal in under those circs?
posh diesel costs about £14 extra over a full tank.
for me works out 80cents
I would run Red if I could !!
why do you not? common rail is the main problem I've done it in the past even here with the old Bosch pump it would run anything even rapeseed, sunflower etc. :whistle2:About 5 years back I Used to bump in to an old boy who bought a new merc 300D in 1998. he was collecting red in 25 litre containers & told me that the car had never seen a fuel nozzle in its filler inlet:laughing:
 
May 31, 2015
12,551
52,300
Cornwall
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36,638
MH
Ducato PVC
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Getting Better
yeah, I’m not sold on the MPG advantage. I just want to avoid having to spend another £7k on Fiat parts when the DPF clogs up.
The strong recommendation when discussing that was “posh diesel or additive” both here and on the Fiat forums.

My hunch is additive is better and cheaper.

Lots of vans running on cheep diesel with over 200k on them and egr and dpf fine, mine has 140k and runs just fine on supermarket stuff….🤔
 
Aug 26, 2022
358
688
North Cumbria.
Funster No
90,895
MH
Hobby Vantana
Exp
Since 2013
Pappajohn has nailed it.

Huge storage tankers at depot and relevant additives added for different brands.
I worked for BP for most of my working days, at one point as a storage terminal shift manager. The ultimate diesel grades got double the additives when compared to standard grades, and supermarkets (mostly) got what they paid for = cheap diesel - no additives.
The additives were very expensive to buy in from Europe, so they must have done some good.
I fill my van with the cheapest I can find from a major brand = a good level of additive without paying over the top and not running on basic brews..........

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Jan 19, 2020
1,990
15,740
Hamble, Southampton.
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68,164
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Downsized to Bongo!
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Since 2012
The DPF in my Merc E Class clogged up last year: the car was sluggish and the gears were being held much longer than normal. I was advised to go for a half hour burn up on the motorway, but as I'd just come back from a four hour motorway trip I didn't bother! I took it to the local MB specialist and they declogged it for me for £250: a great deal less than a new one! It's been going like a race horse ever since...
 
Oct 27, 2022
106
251
Funster No
92,128
MH
Consort PVC
Premium diseasel at Costco is cheaper than supermarket plain around here (17ppl last fill) the difference equates to a 1 litre bottle of Bombay Sapphire gin per tank full. We plan our UK journeys on passing Costco to fill, sad as that sounds.

eg before going to Van Bitz we filled in Reading, on way home from Uphill Marina, brimmed at Avonmouth. Next planned trip away will fill at Coventry on way home. Trip after that Leicester on way home.
Yes, we always check our route to see if there's a Costco fuel station en-route. Premium diesel at lower price than the lowest regular we can find elsewhere. Reading seems particularly cheap !
 

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