I have a 95 960 and its runs good with the exception of white smoke from dipstick and when you take off the oil cap. It doesn't run hot, and the only other sign of a problem would be there is a clicking noise off the engine block. It has around 150,000 miles. Any suggestions?

 

That is usully a clogged vent box or Flame trap.

 

were is those items located???

 

There is a black fitting in the induction hose at the throttle body. check the black plastuic piece and the white insert.
The vent box is under the intake manifold.