When my daughter was in the Britax Marathon (pretty bulky car seat IMO compared to other models I've seen); w/ rear-facing, in the last gen X3 -- we had to move the front seat up to a point where it's only usable for anyone no more than 5'2" (wifey is 5' even
) and the seat back was almost up-right (barely comfortable) -- front seat passenger is expected to bang their knee when getting out of the vehicle.
Car seat in forward facing mode was a bit better (can recline a bit more and move the seat back a bit more) - but the kid can still kick the front seat back (though she was good and not very kicky); thank god the seat backs are hard plastic and can, so it's easier to wipe and doesn't stain.
I'd imagine an e90/1 to be either equal or worse than that.
The e60 has a lot more leg room. We've put the same car seat (in forward facing mode only) and the front passenger seat can be moved back a bit more. Soon, we'll find out what it's like to put the seat in rear facing mode again since my son should be able to get into that soon (I hate carrying that tub in/out of the car!!!).
Not sure if the 335d has the same problems, but my 535i seems to only throw a CEL on in cold weather (bought mine last year in October @ 117k; threw a CEL in Nov.; complains of misfire and changed plugs; threw a CEL again in Mar.; changed all 6 injectors, replaced fuel sending unit [housing was cracked / had a small gas puddle on the driveway and smell of gas] and plugs again; but all covered under CPO)
So now pretty much everything is new minus the turbos (previous owner had HPFP replaced under warranty as well) - lol. This should last me a few more years. :P Though was told that the high-pressure injectors are pretty much only good for 80k and don't last as long as the injectors that are used on the NA motors.
Now CEL is on a 3rd time just last week @134k; haven't brought it in yet, but it's still running strong.
Maybe a NA motor w/ the 530 is more reliable?
If you do find a 5-series; find one with a rear heated seat. Wifey will thank you when she's sitting w/ the kid in the back.