Which octane rating for C6 RS6

Which octane rating for C6 RS6

Author
Discussion

trislast

Original Poster:

37 posts

150 months

Thursday 16th April 2015
quotequote all
The manual and filler cap on my C6 RS6 suggest using 95 octane fuel - is there any benefit to performance or economy by switching to a higher octane? I didn't notice anything running on BP Ultimate 97, but I've not yet tried V-Power 99.

Thanks!

Adrian E

3,248 posts

175 months

Thursday 16th April 2015
quotequote all
If it doesn't state a value above 95 then on the standard map it won't make much difference. If it was mapped for 98 it'd state that on the fuel flap and you'd lose performance using 95 instead

If it was remapped you could gain a bit by using 98 and potentially reduce the risk of detonation.

Running 98 won't do it any harm smile

I run 98 in my S8 as it states that's what it needs (98/95). The more modern S5 states 95/91 so it gets 95

Dr G

15,159 posts

241 months

Thursday 16th April 2015
quotequote all
Yeah, Audi a bit weird like that; they went through a period of mapping even fairly normal/boring stuff for super unleaded.

There isn't even a benefit from improved detergents as everything has direct injection now.