It has to be a 3.5. I have never seen a 3.4 in a 735 or even a 535. The 533i and 733i had 3.3 liter engines. I dunno where you get 3.4 unless they rounded up the last few CCs of the 3.3? steve B ought to be able to confirm,he likely still sees these things, t... Login to read more.