All Things Mk5 > Mk5 General Area
95 RON
Tarmac_Terrorist:
I always use V Power in mine but i've been trying to get a grasp of how these detergents in fuel actually help (aside of keeping injectors clean).
Obviously, higher octane fuel will allow the timing to advance and run better. There is an article in Auto Express this week on buying a used GTI mkv and they very briefly mention cylinder head issues on some arising from using 95 ron fuel??? Unfortunately it doesn't elaborate.
The only cylinder head issues I can imagine is the coking of the valves which can affect some direct injection engines (FSI) (oil mist spraying on the valves i think). The thing is, if the fuel is directly injected, exactly what do the detergents clean anyway?
I'm personally a bit confused as to how 95 ron fuel could harm anything. Perhaps someone could advise in simple terms (I'm no mechanic but have basic engine understanding). :happy2:
bacillus:
Using that lower octane fuel will also mean that your car will emit more enviromentally unfriendly NOx...
btw using the lower octane fuel will cause the ecu to pull timing and run less efficiently vs 98/99 RON fuel hence the lower mpg.
pazz:
--- Quote from: Tarmac_Terrorist on August 16, 2009, 10:10:30 pm ---I'm personally a bit confused as to how 95 ron fuel could harm anything. Perhaps someone could advise in simple terms (I'm no mechanic but have basic engine understanding). :happy2:
--- End quote ---
You generally obtain lower combustion charge temps by using higher grades of petrol. This results in less "knocking" and is more prominent in engine's running high compression ratio's.
See here for a fantastic definition of knocking: http://www.britannica.com/EBchecked/topic/320471/knocking
Hurdy:
I can't see the point in spending £XXK on a sports hatch and then saddling it with a lower octane fuel that won't clean the engine as well as 98 octane, nor will it give you a better mpg, nor is it the recommended fuel for the ED30.......and all for the sake of saving 8p a litre :confused:
Oli:
You'll be wanting to put budget tyres on it next!!!
Don't do it, the engine was designed for the higher octane, and the FSI engines need it, for lubrication and cleaning purposes
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