Faults:

The car's biggest enemy is corrosion, as it is very prone to rusting on the lower edges of doors, fenders, sills, and the trunk lid area.

Being an older model, the carburetor requires adjustments and constant maintenance.

While oil leaks are not common, they are something to be aware of due to the wear and tear on gaskets.

Wear and tear on silent blocks, ball joints and shock absorbers, causing imprecision in driving.

Clutch and brakes changed at approximately 200,000 km, if my memory serves me right since I sold the car almost 20 years ago.

General Comments:

To sum it up simply, it's a German premium car. Near-perfect mechanics and top-quality accessories (no wear and tear in years).

While it's not a particularly fast car, it's not slow either, although it's true that due to the body style and weight, the engine is somewhat underpowered (even though it's reliable and practically indestructible; in the 70s and 80s, this was the primary consideration). Fuel consumption isn't low, but that's to be expected in a car of this type; it's not designed for fuel efficiency but rather for comfort, stability, and reliability, which it achieves perfectly.

It's a very spacious car inside and large outside as well, yet it's very easy to drive thanks to its power steering (one of the few cars that came with it from the factory in the late 70s). It's also agile and easy to park. You can drive a car like this with ease even today; its handling is perfectly suited to modern times despite being almost 50 years old.

The 520i's braking system, while theoretically unremarkable (discs/drums), delivers genuinely satisfactory results. It's worth highlighting the car's stability under sudden braking, which has always been a positive feature. At high speeds, stops are effortless and require no modulation of pedal pressure, and in emergencies, braking distances can be truly remarkable.

In conclusion, it's an expensive car, with very expensive spare parts, but anyone who has owned one can say that the expense is worth the enjoyment of driving one of these cars.

My experience with the 520 is more than positive.