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Thread: Unleaded or Super unleaded in a new car?

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    Regular Member John Bishop's Avatar
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    Default Unleaded or Super unleaded in a new car?

    Quick question guys. A friend has a new car, a VW Up, and under the petrol flap it says super unleaded as oppose to unleaded. Do they need to use only super unleaded and by using just unleaded will this cause any issues with the engine?

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    Full Member gibbon7000's Avatar
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    I was under the impression all cars manufactured for EU/UK should all be able to run on 95ron fuel. As with all brand new cars, take it easy on the revs and speed for the 1000 miles and engine should be fine. Slow and steady wins the race.

    My other car. 1972 1641cc slammed beetle. On the road finally!!

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    Super unleaded is usually only useful for cars that (a) have a knock sensing system, and (b) where the extra BHP gained will be noticeable. IF the UP has a knock sensor and therefore gains 1 or 2 extra BHP, that's a very small reward for all that extra cost of the fuel.

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by John Bishop View Post
    A friend has a new car, a VW Up, and under the petrol flap it says super unleaded as oppose to unleaded. Do they need to use only super unleaded and by using just unleaded will this cause any issues with the engine?
    I would suggest writing to VW for a confirmation of the fuel type to be used (don't include details about the sticker / notice under the fuel flap

    I would also suggest obtaining a brochure for that MY of the vehicle, then checking if there is a note about fuel restrictions
    Also, check the handbook to see what the minimum RON requirement is

    There appears to be conflicting information in general about this car
    However, it does appear this engine was designed for the EU market where the RON rating is higher on Unleaded fuel (the UK rating is lower)

    As a compromise, I would suggest using at least 75:25 Unleaded and Higher Grade Unleaded
    This will then increase the RON to the required level
    However, the ECU on this engine does have a RON sensor and applies a mapping for the lower than expected RON, but this does mean a lower MPG

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    Regular Member Ziggy's Avatar
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    Might be worth a read http://www.upownersclub.co.uk/forum/..._topic876.html

    I have found a few comments saying the VW TSI engines require 98+ ron but nothing to confirm this
    Last edited by Ziggy; 9th November 2012 at 12:01.

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    Regular Member Ziggy's Avatar
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    Regular Member m8internet's Avatar
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    Quote Originally Posted by Ziggy View Post
    the manual says otherwise
    There is note suggesting that the engine does apply a mapping to take into account the lower RON rating in the UK
    However, there is no further information
    This suggests prolonged use may cause minor damage or other fuel related issues

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    Regular Member Ziggy's Avatar
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    point 4 at the bottom of page 6

    "Technical specification notes

    4 Thanks to the knock control, unleaded four star (at least 95 RON) can be used instead of unleaded Super plus."


    HTH

    edit: Just seen you changed what you wrote
    Last edited by Ziggy; 9th November 2012 at 12:55.

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by Ziggy View Post
    edit: Just seen you changed what you wrote
    The link you provided has a lot of the text missing, so had to follow the additional link to the PDF file instead

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    Regular Member john_k_sri's Avatar
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    Quote Originally Posted by Ziggy View Post
    Might be worth a read http://www.upownersclub.co.uk/forum/..._topic876.html

    I have found a few comments saying the VW TSI engines require 98+ ron but nothing to confirm this
    I have also read of issues with VAG group TSI engines. Super unleaded will almost certainly improve engine response on a turbocharged petrol engine without harming fuel economy.

    Standard unleaded should be alright on a TSI in standard tune, albeit with a slight drop in performance compared with Super unleaded.

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