I have only had my 3 series 318i se touring since Nov 2011. The problem i have had is the handbrake wont hold on moderate slopes. I went to BMW main dealer, who found the brake shoes were severly worn and needed to be replaced. Now the handbrake works great. Also the electric radiator fan only works on fast spin. Not to bad for a 10 year old. Since then rad fan replaced, expansion tank replaced. small split leaks when hot. Front near side suspension bushes replaced. Rear near side coil spring replaced (spring broken). Rocker box seal replaced. Sump seal replaced. Long time leak. Drivers airbag module replaced, under national recall. Car now 12 years old, most things are age related. Next year car will be a teenager 13 yrs old, what next ?