TTT I6 sounds insane.
I mean, i've experienced trashing my turbo in a 530Dat, in US currency, it cost me a couple of thousands to fix.
So if all three turbo's went south, that's 6.000 USD at least.
This beeing a S engine, i'm sure we can conclude at least 10 grand og these turbo's blows.
New tech is cool when they work, but after a few years, it will cost alot to maintaine down the road imo!
Looking at S38, S50, S52 and S54, all reliable NA engines that holds up great imo.
And it's not like BMW love the direction the CO hysteria goes, they cope with it well, but the enviroment crap complicates everything, and in the long run, makes it more expensive for us as consumers.
3 series: E30: 89 325i, E36: 92 325iC, 94 320iC, 96 320i Convertible, 94 320iaC, E46: 99 320ia, E90: 06 318i Le mans, E91: 07 318dt
5 series: E39: 97 520ia, 01 530Dat, E61: 09 520Dat
X series: E83 05 X3 2.0d , E84 10' X1 2.0 X-drive DA.