Which petrol?!

Discussion in 'Engine maintenance, upgrades and modifications' started by vestax32, Jan 12, 2010.

  1. 12 Jan 2010 at 5:04 PM #1
    vestax32

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    Does anyone know if running the e46 M3 on standard unleaded has any detrimental effects on the engine? If so what are they? If not what are the effects if any? What do you all think to be the best petrol?
     
  2. 12 Jan 2010 at 5:15 PM #2
    Ian

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    There are countless threads about this so have a search around for some answers; here is one of the main threads that was posted a while ago, but as a quick answer to avoid you doing damage, don't use standard unleaded, the RON level of 95 is below the recommended 97+

    http://forums.m3cutters.co.uk/showthread.php?t=6647
     
  3. 12 Jan 2010 at 5:19 PM #3
    XKaLiBaR

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    Stick to optimax, super, or tesco 99. I was at Thorney once, and some clueless guy came for a remap, expecting to get 400bhp (thats how clueless he was lol). Anyway, he also used unleaded, and on the dyno, his car got 310bhp. I got 356 bhp on the same day.
     
    Last edited: Jan 12, 2010
  4. 12 Jan 2010 at 6:05 PM #4
    vestax32

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    Thanks guys, ill check out the other threads....
     
  5. 12 Jan 2010 at 7:11 PM #5
    Smooth

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    +1 from Xkalibar. Im Shell VPOWER or Optimax only.
     
  6. 12 Jan 2010 at 7:15 PM #6
    chris mc

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    I use Vpower or Tesco99 only.....Esso just opened up closer to my house but no idea what their "Super" is like anyone any ideas?
     
  7. 12 Jan 2010 at 7:18 PM #7
    Smooth

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    Oh Chris your avatar. :)

    Is that a sheep? I thought Sheep was synoomous with Aberdeen. Or shall I not got there.

    MY DISCLAIMER:- No offence anyone.
     
  8. 12 Jan 2010 at 7:23 PM #8
    chris mc

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    Yip it sure is just a bit of porn for those a little more northern than me lol.:thumbsup:
     
  9. 12 Jan 2010 at 10:37 PM #9
    Ritch7

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    man this is one of those stereotype things...

    I know a guy who has owned an M3 vert, Noble, S4 and now currently has the new jag 2 door coupe, i remember him saying its all aload of rubbish really, the manufacturer does state its recommended and it might damage your engine... but does it wheres all the evidence of the engines ruined lol... the 95 ron is just a cheaper alternative and ovbiously isnt as pure as 98/99, but he never has had any problems with any, he thinks its just a gimmick.

    what you want to believe i guess...
     
  10. 12 Jan 2010 at 10:42 PM #10
    M3CD

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    I used 'normal' unleaded on two e46 m3's and a previous 996 and had ZERO issues over the covering 4 years of ownership.

    The only time I had a problem was when I used ASDA's petrol and the car was a bit rough from cold (avoid Asda petrol like the plague - I subsquently found out lots of people had this issue when doing a google search).

    That said, in my current ride I'm using Vpower to be on the safe side - any price premium at the pump come's back in MPG saving.
     
  11. 12 Jan 2010 at 11:24 PM #11
    chattan

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    You'll get zero issues but you will loose power (fact)
     
  12. 12 Jan 2010 at 11:53 PM #12
    lawsy

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    It can cause problems though as well, det can occur with lower octane fuels that the car is not specifically designed to run on,, the standard ecu will retard ignition to counter this thus why low on power, but the fact is there is still det in the first place:thumbsup:
     
  13. 12 Jan 2010 at 11:53 PM #13
    mattbmw62

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    Sure, you get short-term power deficit, the engine management recognises the lower octane and slightly retards the ignition (not sure why, but it does).

    The big question is, does it do any long-term harm and therefore affect the bhp in the long-term ? Earlier posts here, I think, are suggesting that it does ?
     
  14. 12 Jan 2010 at 11:59 PM #14
    lawsy

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    Read my post above yours, we posted at same time:thumbsup: , it detects det/knock/pinking many terms for it. So retards ignition/ups fueling to keep it safe.
     
  15. 13 Jan 2010 at 12:05 AM #15
    chattan

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    Cheers for that :thumbsup:

    I don't understand why anyone would put a lower octane fuel in a high preformance car, fair enough if they don't have access to it, but doing it to save money is just stupid IMO.

    What does it cost? A couple of quide more per tank!
     
  16. 13 Jan 2010 at 12:14 AM #16
    lawsy

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    No problem!

    EXACTLY,

    10p more a litre on a 60 litre tank £6 difference for the fill. Not bank breaking. Why buy a performance car to not get the full performance, and I have noticed a difference on the different fuels. I was caught out once so had to put regular in, it felt flat and the emissions light came on, put full tank of v power in and everything was back to normal.

    My advice is to run v power or tesco 99 etc. :thumbsup: PS det is not good for your engines guys,
     
    Last edited: Jan 13, 2010
  17. 13 Jan 2010 at 12:25 AM #17
    mattbmw62

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    Sorry Lawsy, being stupid, what is 'det' ?
     
  18. 13 Jan 2010 at 12:45 AM #18
    chattan

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    I was running tesco fuel for about 6 months & my car developed a slight hesitation when I planted the foot at low revs (like a stutter) I was thinking the MAF was in need of cleaning or I had a duff coil or plug. Have since changed to Shell V power, I'm on my 3rd tank now & the stutter seems to have gone :confused:

    I've not driven the car a lot, of late due to the weather, so I'll wait & see how it goes once I put a few more miles on her.

    :thumbsup:
     
  19. 13 Jan 2010 at 12:57 AM #19
    Sinth

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    Used to use tesco 99 ron stuff but found the car to stutter alot, been using V power since. Never touch any of the cheap crap.
     
  20. 13 Jan 2010 at 1:22 AM #20
    chattan

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    Same problem as me mate? At low rev/low speeds even when the car was warmed up?
     

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