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D3 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again

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Old 25th June 2021, 11:28 AM
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Default New E10 Petrol............yes/no?

According to the government compatibility list, the A8 (2004), isn't listed:

https://check-vehicle-compatibility-...ufacturer/Audi

Audi
E10 petrol is cleared for use in all Audi petrol driven vehicles, excluding the following vehicles:

First generation direct injection engines:
Audi A2 1.6 FSI, model years 2003-2005
Audi A3 1.6 FSI, model year 2004
Audi A3 2.0 FSI, model year 2004
Audi A4 2.0 FSI, model years 2003-2004
Audi A4 Saloon petrol engine models with OEM parking heater, of model years 2001-2008.
Audi A4 Avant petrol engine models with OEM parking heater of model years 2002- 2008.
NOTE: If your vehicle is listed above you should continue to use E5 petrol. If you are unsure please contact your local Audi dealer.

Should I be worried?
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Old 25th June 2021, 11:53 AM
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No, itíll be fine. E5 will still be available (although most likely only high octane so more expensive)

Expect a small drop in fuel economy in switching from E5 to E10. The pump will always be clearly marked which E content it is
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Old 25th June 2021, 12:06 PM
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Ok, thanks for that Mr E.

I was a bit worried in case they'd missed the 2004 A8 off the 'no, no' list

Still not sure why some Audi engines of this era wont work with E10 though.

Is it the size of the engine, or some other technical thing?
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Old 25th June 2021, 12:25 PM
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I remember asking this about my D2 S8. I'll probably still look for the E5 higher octane fuel where I can.

Looking at the list of excluded cars, are they all the same engine but with different CC? 1.6 and 2.0 FSI?
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Old 25th June 2021, 12:28 PM
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Quote:
Originally Posted by Echo View Post
Still not sure why some Audi engines of this era wont work with E10 though.

Is it the size of the engine, or some other technical thing?
It's to do with early versions of direct injection - basically the system just isn't designed to accept E10. The list of VWs is quite long......
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Old 25th June 2021, 12:34 PM
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Quote:
Originally Posted by Adrian E View Post
It's to do with early versions of direct injection - basically the system just isn't designed to accept E10. The list of VWs is quite long......
Oh, ok, thanks.

Is a 2004 3.0ltr petrol A8 direct injection?
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Old 25th June 2021, 02:28 PM
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I think it's mostly to do with rubber parts like hoses and o-rings, some of the old rubbers pre 2011 ethanol may dry out become hard britle and crack.
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Old 25th June 2021, 12:23 PM
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Quote:
Originally Posted by Adrian E View Post
No, itíll be fine. E5 will still be available (although most likely only high octane so more expensive)
Another reason to make sure SWMBO only ever puts 99RON in our cars....

And I'm sure we've had this discussion before, but E10 is too short to search for.
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Old 25th June 2021, 12:29 PM
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Quote:
Originally Posted by HPsauce View Post
Another reason to make sure SWMBO only ever puts 99RON in our cars....

And I'm sure we've had this discussion before, but E10 is too short to search for.
Yeah, I did try a search in case it's been covered before, but couldn't find anything.

Was getting slightly paranoid about it, lol.
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Old 25th June 2021, 04:07 PM
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Quote:
Originally Posted by HPsauce View Post
And I'm sure we've had this discussion before, but E10 is too short to search for.
So did I. But that might have been on my Coupe or Panda (but not Tesla ) forum...it's been a long week.
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