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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Off-Topic Discussions > Super Unleaded V Unleaded



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      03-16-2009, 05:28 AM   #1
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2006 325i  [0.00]
Super Unleaded V Unleaded

What is the difference between the two? I use super unleaded most of the time because apparently it is is better

For you who know, let me know what I should be using more often


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      03-16-2009, 05:59 AM   #2
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The higher the octane rating the more engine knock is overcome, obviously this is only a good thing so in my opinion buy the highest octane offered!

Super varies from 97-99 (sometimes over 100 as well) depending on where you get it. VPower is 99, BP Ultimate is 99, Sainsbury's is 97, Tesco 99 etc.

Interestingly 4 star leaded petrol is 99 oct. and if you put lead additive (tetraboost) into petrol you can achieve over 100 octane petrol very easily, don't do this though because lead is bad for new cars
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      03-16-2009, 06:19 AM   #3
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It's a few years ago but I ran super unleaded in my then new Rover 600 GSi for about eight months without realising that normal unleaded was fine.

I immediately switched to normal unleaded and thereafter noticed NO difference in fuel consumption or performance but did notice that I had thrown away a couple of hundred quid for nothing in the previous eight months.
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      03-16-2009, 06:36 AM   #4
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Thats interesting perhaps it is a case of "does your car need it?"

If 97-99 is recommended use it, maybe that is a better way of going about it? For my MR2 turbo I have been told by people who know MR2 T's not to use anything less than 99, my Boxster S I used 95 a couple of times and it ran REALLY rough.
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      03-16-2009, 06:38 AM   #5
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Most high performance petrol engines are DESIGNED for high octane fuel - they will run at a lower octane (95RON) with reduced power. The electronic will automatically cater for the lower octane level.

My 325i (and yours!) needs high octane fuel for correct performance, as did my previous Audi A2 2.0T and my Toyota Celica VVTI. The Beemer performance difference is not quite as noticeable as my previous cars but is defo livelier with the better fuel in. I always run on BP ultima (99 I think). My Celica was as flat as a witches tit on 95RON fuel, and when it should have 'come alive' at 6500RPM it felt underpowered. The engine craved high octane fuel and was the only fuel it ran properly on.

Look inside your filler cap and it should tell you what is required, although if the same engine as mine, BMW spec 98RON or higher.

Older cars that are designed to run on normal fuel will notice little diiference running on higher octane fuel (such as Alan's old Rover) as the electronics have been designed to run on 95RON fuel.
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      03-16-2009, 07:36 AM   #6
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I have, for as long as I can remember, had a fuel card; as such, my cars have almost exclusively been run on top juice.

I don't think I have ever run the beemer on std unleaded - it's always been optimax/V-power - so I can't comment on performance gains on this engine running it, because I have no basis for comparison.

However, my previous car (Impreza) always felt 'flat' on the 3 or 4 occassions (in 3 years) I was caught short and had to run a tank of non-V-power. It certainly felt like it lost some sparkle/responsivity and mid range grunt, although it could well have been in my mind, expecting it to be worse.

I have seen a number of magazine tests that show, with 'performance' cars (i.e. not your average 1.2l corsa shopping trolley) there are gains to be had.

I have never, nor would I, run supermarket fuel - too many horro stories locally of wrecked engines, and too many reports/too much evidence leading back to supermarket fuel to trust it.
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      03-16-2009, 08:40 AM   #7
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Im more into Jet engines lol...but i did watch and read these studies and yes Simon is right they do make a big difference to higher performance vehicles.

Average motor makes it run smoother with little gain.
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      03-16-2009, 09:00 AM   #8
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I always use V Power in my petrol cars - just through habit really.

However I also always use BP Ultimate diesel in my oil-burners - and that IMO is noticebly better than stock diesel - smoother, better MPG, better performance.
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      03-16-2009, 12:00 PM   #9
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Ive only ever run the DXB on the expensive denzil. When for a month i ran on shit juice. She felt FLAT as fuck.
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      03-16-2009, 12:03 PM   #10
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i chuck anything into it when ever, allways felt them same and dyno well too, we did see a m5 running on the dyno which was putting out less bhp tryed a few times to get it up but no good, found out he had just fillied it with the cheap stuff
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      03-16-2009, 12:13 PM   #11
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VPower is the only way to go

Put 10 BP Ultimate in today, was going to fill but at my local petrol station it is only 97 RON not 99!!
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      03-16-2009, 12:25 PM   #12
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10 quid, must last only ten mins.
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      03-16-2009, 12:58 PM   #13
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Yep lol enough to get to Shell at Derby and fill up with VPower

Not cheap 16mpg car isn't
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      03-16-2009, 01:08 PM   #14
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Tell me about it, Especially when denzil is over pound a litre.
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      03-16-2009, 01:11 PM   #15
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Yep Petrol is getting that way again too.

Fact is diesel should be cheaper to buy but isn't, not good

Oh well lets look on the bright side we have lots of FUN with our cars so
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      03-16-2009, 01:12 PM   #16
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yeh but at its peak down here it hit 1.30 for nomal diesel,must be 1.50 for the good stuff
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      03-16-2009, 01:37 PM   #17
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Isn't the term "unleaded" a misnomer? It should rightfully be called "non-leaded" since gasoline/petrol had lead added as a knock inhibitor. So, if it is missing an additive, why did unleaded fuel cost more than its leaded sibling?
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      03-16-2009, 01:53 PM   #18
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Leaded is more expensive, at least now and is not readily availible either!

More expensive because the government / petrol station wants to make more money probably!
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      03-16-2009, 03:42 PM   #19
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Right. Next time I fill up, I will use the super duper diesel and see if it makes any difference at all. I'm not expecting it to, but we'll see what happens. It should cost me over 3 more for the tank full.
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      03-16-2009, 03:43 PM   #20
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Fill through about 3 tank fulls.
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      03-16-2009, 03:46 PM   #21
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Quote:
Originally Posted by dxb335d View Post
Tell me about it, Especially when denzil is over pound a litre.
Carlos, I've just filled up and V power unleaded is 95.9 and the V diesel is 98.9. Not sure if it's because there's a Total garage opposite and a Morrisons within 2.5 miles so price wars etc.
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      03-16-2009, 03:47 PM   #22
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Quote:
Originally Posted by beemerbird View Post
Carlos, I've just filled up and V power unleaded is 95.9 and the V diesel is 98.9. Not sure if it's because there's a Total garage opposite and a Morrisons within 2.5 miles so price wars etc.

Im still paying 1.10 ish.

But at its peak round here was nearly 1.50.
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