I have a 98 328is that I bought with 30k on it used, I have since put 110k on it. Still going strong , the only way is to stay on top of the maintenance and sevicing and that can be costly. Unless you are very mechanical and or very rich.
98 328is Sport Package M3-Spoiler and Front End,
Turner Motorsports 4 Wheel drilled Rotors.
Axxis Brake Pads, Teflon/Stainless Brake Hoses.
UUC Sachs Stage 4 Suspension.
Sway Bavarian Sway Bars.
H&H MotorSports Front and Rear Strut braces.
Conforti CAI and Shark Injector.
UUC System U DTM Exhaust
UUC Short shifter , Tranny Mounts and Clutch Stop.
F1Danza Lightweight Flywheel with M-3 Heavy duty clutch.
Factory BMW M3 Front Bumper with Splitter.
More to follow...MUCH MORE !