Poor Fuel Quality

[Leadfoot]

Hi all,

Due to the high petrol prices over the last few months I have been running my car on the cheapo 95 octane grade. I had been noticing that my car was running very rough and was contemplating the engine mounts, spark leads or even the 6 month old plugs, since it is designed to run on 95 octane.

As an experiment I ran the tank nearly dry and put in £20 of 97 grade and it is purring away again. Glad I didn't strip it down!

I don't remember the car behaving like that when I first got it 6 months ago so is it my memory or have I just gotten used to the smoothness and can now detect slight changes when running on low grade?

Anyone having similar experiences?

Cheers,

Leadfoot

[legendswraith]

Hi all,

Due to the high petrol prices over the last few months I have been running my car on the cheapo 95 octane grade.  I had been noticing that my car was running very rough and was contemplating the engine mounts, spark leads or even the 6 month old plugs, since it is designed to run on 95 octane. 

As an experiment I ran the tank nearly dry and put in £20 of 97 grade and it is purring away again.  Glad I didn't strip it down!

I don't remember the car behaving like that when I first got it 6 months ago so is it my memory or have I just gotten used to the smoothness and can now detect slight changes when running on low grade?

Anyone having similar experiences?

Cheers,

Leadfoot

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don't think its down to the slight drop in octane fuel is hydroscopic it absorbs water and you will always find a few garages that are reknown for having water in their tanks. there used to be a few you had to avoid like the plague around here if you always fill up at the same garage try changing where you get it from

[chips229]

I ran my old mk1 LS of the normal unleaded and found it ran fine,i did try a tank full of the Super unleaded,reset the ecu and didnt find much difference apart from it costing alot more to fill the tank up.

Maybe like legendswraith says its the fuel

[ColinBarber]

I would think 90% of LS owners use 95RON and don't have a problem.

[Chris Skelton]

I would think 90% of LS owners use 95RON and don't have a problem.

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Yes. Use Sainsburys/Tesco/Morrisons/ occasionally Esso, all 95. No problem (LS400 Ser 3)