Hi, I have a problem with rough ride with my 88 535i. The strange thing
is after being up on a hoist the ride is buttery smooth for around 5 to
10 km before hardening up again, so I know my vehicle is capable of
doing much better. Any ideas how I might fix it?

I've already replaced a lot of bushings and nothing is loose, and
nothing is visually wrong when inspected. I do sometimes get a clunk
around the driver's floor when turning a sharp corner like into a
driveway. I am told it is a weak left shock but it feels more like the
steering box area. I don't want to spend too much as the vehicle has
only 3 or 4 more years due to rust.