Shock Absorbers, Leaking

WARNING: This page is about a different variant/trim than selected.

Shock absorbers are frequently rejected and exchanged because of leaks. Examinations on the test stand and on the vehicle have shown that the replacement of a large number of rejected shock absorbers was not justified.

Slight leaking of oil ("sweating") at piston rod seal is no reason to replace a shock absorber. A shock absorber damp with oil is OK under the following circumstances:

Oil leakage (shaded in illustration) is visible, but dull, matte and possibly dry due to dust.

Fig 1: Identifying Fluid Leakage
Courtesy of AUDI OF AMERICA, LLC
Oil leakage extends from upper strut connection (piston rod oil seal) no further than lower spring seat -arrow-.

NOTE:

Minor Oil Excretion Is Advantageous Since Piston Rod Oil Seal Gets Lubricated, Which Increases Service Life. This Is True For Front And Rear Shock Absorbers.