Thank you for your answers but i am still in doubt. So if i buy a 07 bmw 3 series that comes with navigation i have to buy this option "i-drive" or having a 07 bmw 3 series with navigation means that i have i-drive in it? Is there anyway that the i-drive from an 07 could be update to the 2011 version?
I'm asking all this because soon i will buy an 07 bmw either 335i or the 328 and i saw this video on youtube showing that the navigation shows the information levels of brake pads, oil, and other fluids, which i think it's pretty legit. Other navigations do not really do that, at least that i am aware of.
Is the main difference of a 335i and 328i the looks and the power or there's anything else?