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The subframe issue is something to watch out for on early build E46s: 1999-2000.
The E46 (and E39) are the last BMWs that are DIY-friendly. Parts are readily available (and cheap if you know where to source them other than the stealer) and information about how to handle routine maintenance to complex problems is available all over the internet. With that said, the E46 was designed to last the duration of the warranty period and since most examples are now around 10 years old, you will run into some issues that require attention. Here is what you need to take care of when you acquire an example (if it hasn't been done by a previous owner):
- Cooling system refresh: thermostat, water pump, expansion tank, and hoses (roughly 300 bucks in parts from a supplier in the States)
- Valve cover gasket (20 bucks and 2-3 hours labour). My cover was warped and the cover cost me about 220.
- Crankcase vent valve: 100 buck part and about 4 hours in labour
- Worn guibo: part is about 50 bucks and will require you to drop the exhaust to change
Considering the condition of the car, you may also need to overhaul the suspension:
- Control arms
- All bushings
I would of course want to see routine transmission, brake, and differential fluid changes. And don't forget about the possibility of having to replace window regulators (about 130 a pop.)
Are E46s reliable? Compared to other BMWs, relatively. Are they reliable like Japanese cars? No because BMWs are engineered differently. My theory is that you pay a penalty for driving feel and that penalty is preventative maintenance. But, if you're willing to put in the time (or spend the money), the E46 is a very enjoyable car. Again, it's really one of the last cars that drives and feels like a BMW.
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