what petrol for standard S4

[Bushy]

News to me too, bit misled then

But how come Millers gives the same feel as going from 95 to 98??? cant surely be 0.2 difference?

[johneroberts]

Millers may raise the octane by 2 points dont forget this is 0.2 . ie from 98.0 to 98.2

Just Rang Millers Technical department and its 2 octane added to 50lts to any unleaded fuel, it can be less effective if the amount is greater.
Just for the record [img]images/graemlins/grin.gif[/img]
jr

[SJS]

Millers may raise the octane by 2 points dont forget this is 0.2 . ie from 98.0 to 98.2

Just Rang Millers Technical department and its 2 octane added to 50lts to any unleaded fuel, it can be less effective if the amount is greater.
Just for the record [img]images/graemlins/grin.gif[/img]
jr

That maybe what they are saying, and they could be correct although i am no chemicasl expert. Do the maths. Assuming a bottle of octane booster is 1 Litre.

50litres x 95 octane = 4750
+
1 Litre x 200 octane = 4950

4950/51 = 97.05

So you would need a fuel of 200 octane to raise 50 litres by 2 "points".

To put that into perspective, NASCAR racing cars use 130 Octane fuel, which is similar in rating to Toluene. I dont think somehow millers have invented a super fuel, more likely hype.

It may raise the rating by 0.7, this i have seen before, but not 2. [img]images/graemlins/thumbs.gif[/img]

[robertmfreeman]

EVO mag did a test with the various fuels listed. Optimax came out as the mutts nuts on loads of different cars [img]images/graemlins/audiS4black.gif[/img].
Cheers,
Robert [img]images/graemlins/audiS4black.gif[/img]

[DavidR]

I use standard unleaded most of the time as the difference between that and optimax doesn't justify the cost or reap an advantage in MPG when commuting to work [img]images/graemlins/smile.gif[/img]

In fact i think in a blind trial of optimax vs 95ron i must admit I would struggle to notice the difference.

Perhaps we should try this with some of the die hard optimax supporters [img]images/graemlins/smile.gif[/img]

[Joshie]

I'm tempted to use standard unleaded plus octane booster but I'm concerned about pinking which I used to get when I was running the Abt chip.

[toasty]

I had to put standard unleaded in mine the other day, as the shell garage had ran out of Optimax [img]images/graemlins/frown.gif[/img]

The car just isn't the same without it, and what's more I reckon it then takes a couple of tanks of Optimax to get it back on form.

As for Millers though, I don't notice any difference, but then I would imagine it has more effect on tuned/modified cars. Certainly Bushy and others swear by it

[Dippy]

I reckon it then takes a couple of tanks of Optimax to get it back on form.

Or you could reset the ECU