Touareg: 2008 V8
Join Date: Jun 2015
Location: Canby, OR, USA
Second Vehicle: 2007 V6
Thanked 100 Times in 99 Posts
Only premium, highest octane you can get. Yes I have run regular, but seeing as apparently low octane can result in carbon build up on the FSI motors, I would only run premium.
I did not know this when I purchased my 2007, and switched to premium quickly when I realized the cost was the same as my mileage was worse than terrible on regular.
I have heard people say only Tier 1 fuel too...I see signs at stations in my area for this...BUT after talking to some station attendants I confirmed something I had started to notice...the same truck delivering fuel at both Tier 1 and wholesale locations.
Lastly, there is no such thing as "plus," all it is is a blend of premium and regular. There are apparently only two tanks (three if diesel is sold) at service stations...selecting plus blends the fuel in the system before being pumped into your car.