Hi Sifus,I wish to get either one of this two models. Used E46(318) or E39(520/523) which is reasonable? I am not too familiar how to checking the car is in good condition. Which is I must carefully check & know them in the oftenly problem. I heard alot the BMW always easy get over temperature & Sensor problem, Is it true? So, how can I check & see them before I choose the car are very good condition or not? Whatelse, much sensitive spoilt and fragile parts inside the car? I must carefully choose the car otherwise I will spend much expensive for repair & maintainance...