Ib5/IB6, do you really think having one extra gear mean it takes a HALF liter less? Seriously, the transmission takes 2L, it works better, feels better, sounds better, it just works RIGHT vs fucked up, I'm done discussing this. To top it all off, the one before it with one less gear takes 2.1L, I have NO idea why people are going on and on and on about proof of this or that when EVERYONE other than the manual itself is saying this. I simply don't care any more... Now you and I agree that the 2L is what works best in this, not sure why you are entertaining the rhetorical nonsense that comes from all the pointless questions, I'm moving on from this thread, I don't care about proof, it's just pointless to worry about it anymore when it's universally known what actually works best, I literally ca not possibly care any less about proof of anything when the questions are coming from someone who even said what he drained came nowhere near to the 1" from the top that is said to put in, that's all the proof on top of fantastic results that's needed, no reason entertain his OCD madness any longer.