This 530i is well designed and the overall reliability is good. Beyond 150K miles, I started having some oil leaks but it's all fixable. Over 150K miles. the original radiator was replaced, a rear window actuator replaced around 60 Kmiles and the regular brakes were replaced front and back every 30 to 40K miles. Spark plugs replaced every 100K miles. DTML pump was replaced around 90K miles. The coolant tank was replaced around 120K miles but this car is solid and performs well month after month. The starter was replaced at 148K miles as well as a front wheel(crack in the metal). The microfilter needs a change every 30K miles and the trunk actuator had to be replaced at 165,000 Miles. It has 179K miles and it's still going strong! I religiously get an oil service every 7,500 miles + visual inspection. The external body still looks great but the car spends its nights in a covered garage. Total maintenance costs(incl. $3,800 100K warranty) = $18.425(incl. 4 sets of tires) up to date.
I bought this car three years ago and I've generally been quite satisfied. It gets decent mileage overall and over 30mpg on the road. New passengers not aware of the brand will often ask what kind of car it is because it's so comfortable. Since the car has had very little wear its frequently confused with a newer car since the basic body design remained the same until 2010. It does have some flaws. One of these is that the I-Drive computer occasionally doesn't boot at start up and leaves me without a radio until it does. The radar detection often takes a while to shut off after leaving a parking space. However in the basics like comfort and performance the car is great. I did purchase an extended drive train warranty, but I've recently had a large number of systems fail in short order including the water pump, purge valve, and transmission pan and filter. There's also the standard German oil leak which is so minuscule that I've chosen not to fix it. My mechanic and I both think that this bad period will pass and that the car will remain reliable so I'm currently still positive about it. It's a great machine.
2006 BMW 5 Series 525xi 4dr Sedan AWD (3.0L 6cyl 6M)
We purchased our 525xi secondhand at a BMW dealership and it was certified used. The interior comfort is great, and road noise is minimal. The only thing I don't like about our 5 Series is the iDrive system. It can't be avoided (option up a standard radio like in the 3 Series), and it has radio presets, but there are no preset buttons (you have to use iDrive to get to them). The car also has an annoying "grab" in the transmission, a software issue. The performance is great. I love this car.
Comfort, Technology, Performance
Annoying "grab" in transmission, iDrive could use improvements (specifically, the preset buttons aren't there)