Inspection (Leaks)
Shock absorbers are often thought to be leaking and are unnecessarily replaced. Tests on test stands and on vehicles have determined that very often replacement was not necessary. Slight oil escape ("sweating") at the piston rod seal is not a legitimate reason to replace a shock absorber. An oil moistened shock absorber is OK under the following conditions:
- Oil excretion (shaded area in Fig 1 ) is visible, but dull, matte and possibly dry due to dust.
- Oil escape extends from upper strut connection (piston rod oil seal) no further than the lower spring seat (arrow).
NOTE:
Minor oil excretion is advantageous since the piston rod oil seal gets lubricated, which increases service life. This is true for front and rear shock absorbers.