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Old 10th September 2020, 09:59   #1
donc
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Default Premiumfuel

After sometime using supermarket fuel I recently changed to premium in an attempt to improve emissions and a smokey exhaust. Must report it has worked wonders . The car a 1.8t runs smoother and the exhaust is visibly cleaner. Has anyone else found this?
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Old 10th September 2020, 10:22   #2
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Only when towing a caravan have a noticed an improvement, normally I'd just fill up with standard. Now I have a diesel I just used standard towing or solo

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Old 10th September 2020, 11:29   #3
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Never used supermarket fuel - my mechanic says they don't put as many additives in, which it why it is all of £2.00 per fill up cheaper. Not worth the risk.
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Old 10th September 2020, 11:45   #4
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Supermarket fuel is garbage, I tend to avoid at all costs unless its the works van.

The main benefit of premium fuels seems to be the added detergents they put in to keep the engine and fuel systems cleaner, though you are likely to see a benefit of this only through prolonged use, not just a single fill up of premium once or twice a year.

That being the case, I would think premium fuel would be of more benefit to diesel owners as it tends to be a dirtier fuel in the engine.

If you are after economy benefits, it's a bit of a grey area.

I'm not sure about diesel as I've never owned a diseasel, but with petrol, a higher RON fuel typical of premium unleaded allows you to more comfortably change up a gear at slightly lower revs due to an increase in low down torque.

I am adamant I can feel this in my 75 - running on supermarket fuel it just feels lazy so you have to give it an extra 200-300rpm before shifting up, particularly noticeable when on a slight incline.

This is where you can in theory save a few pennies on your cost of fuel as changing up earlier means you keep the revs down which in turn means you are using less fuel. Whether it outweighs the additional cost of putting the premium fuel in your tank is another argument altogether.

I don't believe there is any economy benefit to using a premium fuel if you are sitting at 70 on the motorway all the time - the benefit is to be had lower down in the rev range.

Personally, I only use premium because I like the idea that it keeps the fuel system and engine cleaner than a cheaper fuel, which I appreciate when running an older set of vehicles such as ours.

I have read many stories about people that struggled to get their older cars through the MOT due to failing the emissions tests, but a good use of premium fuel beforehand seems to get it through.

I previous had an Alfa Romeo MiTo with the TwinAir engine (900cc, 2-cylinder, turbocharged) and it ran like absolute shizz on supermarket fuel and sounded like a bag of spanners - it was notably better on premium.
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Old 10th September 2020, 12:01   #5
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I use allways premiun diesel ( optima is called here)
my car is Stage 1 to 175 cv.
Economy ? well i made 80 klm dayle 95% motorway and 5% 5 city
Driving 95-100klm /h i made 5.8 liters on 100klm
driving 120-130 i made 6.5 liters on same
i think not so bad for a 16 years old car whit 243.000 klm
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Old 10th September 2020, 13:34   #6
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Mike Noc on here was reported to have some of the best injectors on the forum, he only ever uses supermarket diesel i think, his car is now 400,000 miles and counting if i am right.
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Old 10th September 2020, 17:38   #7
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You'll also find respected all singing all dancing fuel additive products which contain the extra detergents and injector and fuel line cleaners put into premium fuel which also raise the cetane or octane rating of your fuel much much cheaper than using the premium fuel at 10p a litre extra.
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Old 11th September 2020, 08:45   #8
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Quote:
Originally Posted by Arctic View Post
Mike Noc on here was reported to have some of the best injectors on the forum, he only ever uses supermarket diesel i think, his car is now 400,000 miles and counting if i am right.
Yes now 407k Steve and still running fine.

It was my company car for the first couple of years so I used the cheapest derv I could find, and it was serviced as per the schedule every 15k miles.

When I bought it I carried on the service regime and continued to fill up as cheaply as I could and on this particular diesel it has worked well.

Nothing lubricated by the oil has ever been replaced, and the injectors have never been out.
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Old 11th September 2020, 09:16   #9
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I have to agree the premium fuel seems to make my van run better, I usually put BP but I lent it to a mate and he filled it up as a thank you. I seemed flat and was under performing. I asked him what he had put in it and he just said '' what ever they sell in Sainsbury's''. 400 miles later I put the BP back in and it was back to normal.

The supermarkets but what ever they can get hold of. There was a problem a few years ago that one of them I think it was Tesco's was bunging up filters or causing problems in some way.
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Old 11th September 2020, 18:53   #10
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Quote:
Originally Posted by Mike Noc View Post
Yes now 407k Steve and still running fine.

It was my company car for the first couple of years so I used the cheapest derv I could find, and it was serviced as per the schedule every 15k miles.

When I bought it I carried on the service regime and continued to fill up as cheaply as I could and on this particular diesel it has worked well.

Nothing lubricated by the oil has ever been replaced, and the injectors have never been out.

Quick query Mike, do you use injector cleaner at all?
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