Rear shocks "refill"

["Bert Van der Stee" <bert.van.der.stee@pandora.be>]

Hi,
does anyone have experience with "refilling" the rear levertype shocks ?
Mine are worn and my mechanic told me that I should try filling up with old
engine oil.  If they don't leak the shocks should  be back up to the task.
Did anyone try this and with what type of oil ?
Rgds
Bert