Which fuel?

4.2 V8 32v FSI - 444 bhp
Post Reply
robster
1st Gear
Posts: 63
Joined: Sun Jan 06, 2019 9:24 pm

Which fuel?

Post by robster » Wed Feb 20, 2019 12:14 pm

Picking up my B8 on Fri and wondered what fuel to use.

Ran 95 in my S4 but do I need to use 99 in the RS?

User avatar
Surrey Sam
Cruising
Posts: 4195
Joined: Tue Nov 27, 2012 7:34 pm
Location: Sussex

Re: Which fuel?

Post by Surrey Sam » Wed Feb 20, 2019 12:20 pm

Congrats.

Running lower RON fuel will pull engine timing, even on a S4. The engine will run fine on 95 though, as the ECU will just adapt, but it'll run slightly better on 98/99. Dyno figures also support that fact, especially when tuning the 4.2 V8.
Sepang Blue B8 RS4, MY14, All option packs, B&O, Adv Key, Adapt Cruise, Pan Roof, Akrapovic Titanium Exhaust, + more.
Previous - Sprint Blue B7 RS4 Avant, Ceramics, Sunroof, SS+, Buckets, FBSW, Bluetooth, 2010+ RNSe
Previous - Phantom Black B7 RS4 Avant, Black Optics, Titan pack, SS+, Buckets, FBSW

johnnydog
3rd Gear
Posts: 481
Joined: Sat Jun 11, 2011 8:24 pm

Re: Which fuel?

Post by johnnydog » Fri Feb 22, 2019 6:41 pm

Shell V Power is regarded by many as the best fuel for the RS, both for cleanliness and performance, although Tesco Momentum 99 is also supposed to perform well. I have used Tesco Momentum in the absence of a Shell garage, and not notified any difference in performance. There is also a big price difference between the two which equates to a decent saving per tankful if price is a consideration.

HPsauce
4th Gear
Posts: 788
Joined: Tue May 19, 2015 6:31 pm

Re: Which fuel?

Post by HPsauce » Fri Feb 22, 2019 7:48 pm

It's definitely RTFM, but almost all performance Audis run "optimally" on 99 (or so) Octane petrol, but will run happily on 95.
Both my S8's (32 and 40-valve) would actually run on much much worse than that being N/A but usually got fed 99.
Even my little Volvo (250bhp T5 turbo) gets "optimum performance and fuel economy" on 99RON according to the manual.

So they all get fed on V-Power or Momentum. I find Momentum just as good and significantly cheaper, plus Tesco is nearer.

Post Reply

Return to “RS4 (B8 Typ 8K) 2012-2016”

Who is online

Users browsing this forum: No registered users and 129 guests