If I were you, I would be getting 7k oil changes in your TT. If you are going to keep it. I would stick with OEM but change it much more often than the bs BMW recommendations..... Just watch your gage fly when you start hammering on the TT

__________________
2012 X5 50i ZAP(2VA, 336, 465), ZTP, ZPP, ZPS(6VC), ZCW, ZRC, 322, 4UB, 4NC, 610
2011 ///M3 Silverstone II
2011 X5 50i(lemon)
-- SOLD --
08 550 Msport
07 X5 4.8I sport
04 545i sport
02 4.4i sport
01 540I M/sport
00 SL500
97 SL500