KMM:

Thanks for the review. 

I find the X4 M40i intriguing. Did you get a chance to drive it?

 

Nope, sorry. But I do own a 435i and it's basically the same engine. I don't know how heavy the X4 is, but I think the diesel would suit the X4 better. In encourage you to test drive the X4 M40i before you make any decision. That said, the 35i/40i engine is one of the best in its category.