[A4] Need for Premium Gas in 1.8T quattro?

Grant Lenahan glenahan at vfemail.net
Thu Sep 21 19:46:01 EDT 2006

Nonsense. The main difference between low and high octane is:

1.) more resistance to knock
2.) sometimes, a better detergent package (since its more expensive)

A turbo engine, by definition, operates at a high effective compression 
ratio.  So high octane is almost a requirement, mitigated only by an 
knock sensor which will retard timing and performance to protect the 

More detergent will result in cleaner running.

I have no idea what "more combustible" means in this context, so I wont 

On Sep 21, 2006, at 1:46 PM, thejimrose wrote:

> i wonder about this too.. from experience with ducati's, the 
> reccomendation
> is always run high octane, but lota of guys ran low octane as it's more
> combustible and tended to build up much less carbon in the head + 
> valves.
> not sure how that might translate.. but i seem to get much better 
> mileage if
> i run premium, which i think offsets the price of the gas..
> jim
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