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Old 24th November 2008, 06:08 PM   #1
Wolsty
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Thumbs up Unleaded vs Super Unleaded...

Fellas, apologies if this has been answered but I can't find any corresponding threads....

Does using Super Leaded make much difference to the amount overall mileage and the general upkeep of the engine?

I tend to alternate between unleadaed and super unleaded....

Thoughts?
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Old 24th November 2008, 06:28 PM   #2
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Super is better as the m3 like the better octane, higher octane prevents engine knock.

useful site, gives info about fuel too

http://www.petrolprices.com/

Last edited by SimonM3; 24th November 2008 at 06:42 PM.
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Old 24th November 2008, 06:53 PM   #3
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hi mate,
when i bought my car i filled the tank with normal unleaded and drove 200 miles home,i noticed that it pinked a bit on a few occasions when i gave it some.so i had to drive it like a granny until all the petrol was used up.
now i only use shell optimax,no pinking and feels a bit faster.so defo use super unleaded .cheers mate.mark
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Old 24th November 2008, 09:16 PM   #4
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Tesco's 99 octane is the best! there is a write up about it on thorney motorsport link i've got one local so i also shop there and they have 5p off a litre when you spend 50 or more on shopping and they have that offer on most of the time!
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Old 24th November 2008, 09:24 PM   #5
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Tesco 99 rules. What you pay extra per liter you get back in MPG and your giving your car the stuff it needs to optimise its performance!
No Brainer IMO
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Old 24th November 2008, 11:12 PM   #6
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Another point for the Tesco i say! Defo super!!!
Nut
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Old 24th November 2008, 11:19 PM   #7
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I always use Tesco's 99 when possible
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Old 25th November 2008, 10:03 PM   #8
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hi guys,
i might give it a go after reading that.
ive always stayed away from supermarket fuel,always used what i thought was the best [shell optimax]
cheers for the info.mark
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Old 25th November 2008, 10:20 PM   #9
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Yeah the tesco 99 ron fuel is very good. I always get it from tesco in Banbury, and that gives me an excuse to drive down the A361, which is an awesome road!
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Old 26th November 2008, 01:58 AM   #10
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I give it a go is well for tesco fuel. But i always thought shell vpower was best.
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Old 26th November 2008, 03:31 AM   #11
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Don't quote me on this but the tesco has 10% ethanol compared to shells 5%
Also tesco's is 99ron and shell is 98ron its only 1 but "every little counts"
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Old 26th November 2008, 12:06 PM   #12
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Thanks Chaps for the advice, I've always tended to steer clear of supermarkets and like Mark and Billy I use Shell V-Power.. but I'll give Tescos 99 a go too....
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Old 26th November 2008, 01:15 PM   #13
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In the manual for my E36, it states to use minimum 98 octane fuel, and I'd be surprised if the E46 was any different.

I alternate between Tesco 99 and Shell VPower, depending on where I happen to be.

Cheers,
Steve
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Old 26th November 2008, 06:53 PM   #14
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Think the Tesco fuel has 5% Bio ethanol in it as well, http://www.petrolprices.com/tesco.html .

I just happen to be looking at this site the other day
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Old 26th November 2008, 10:46 PM   #15
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So does the ethanol count make a difference? If so how and why? Just curious thats all.......
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Old 26th November 2008, 10:50 PM   #16
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Ethanol is very very flammable! dragster fuel has a very high volume of ethanol in it.
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Old 27th November 2008, 03:57 AM   #17
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did you read the link i posted above ^^^ link it doesn't explain the ethanol exactly but gives a good explanation on the different types of fuel they tested and some of the science behind it and as matt said its very flammable so you get more bang making more power!
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Old 27th November 2008, 05:39 PM   #18
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Cheers Jeff, having problems with the link due to your avatar.... ie. I can't stop watching her....seriously Tesco 99 is the future then!
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Old 27th November 2008, 06:47 PM   #19
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I always fill up with tesco's super but i have once or twice had to fill up elsewhere and even with normall 95ron and i definitely noticed a difference, i know some M3's even experience pinking when using standard UL mine didn't do that but it wasn't running as smooth for sure, its more expensive but its a cleaner fuel so better for your engine and i would even go as far as it gives better fuel econemy, although its more expensive its only 3-4 on a tank full so its got to be worth it.
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Old 29th November 2008, 11:45 PM   #20
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Tesco is supposed to have a performance advantage over optimax which has been proven in tests, although shell optimax is ment to be better for your engine as it has more cleaning agents in the fuel and a lower sulphur content. Optimax or v power has now been upped to 99 octane too.

Personally i would only run an M3 on super unleaded. Due to the problems tesco had last year with the tanks not been cleaned out correctly i usually use optimax but if the wife comes back with a 5p off voucher for tescos ill put that in.

Both are top scorers in the fuel tests anyhoo !

Last edited by reidtastic; 29th November 2008 at 11:58 PM.
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