HPFP issues... google it.
if you are one of those guys who just goes to whatever gas station and will put whatever gas (87) then this car is not for you.
Although most euro cars recommend 91 and most will be happy... the TT engines are very picky. North american gas is one of the dirtiest and even at 91 you have to be careful where you buy the gas, as it may cause a CEL.
The most important thing is 535 started in 2008 as lci models with upgraded lights and other minor improvements... pre 2008 was 530i only