Originally Posted by rc_square24
I have never had an o-ring expand from the shock oil (for me at least).
They do expand if you spray motor cleaner/degreaser on them.
+1... just rebuild my shock and clean the o-ring with motor spray.. it did expanded (not sure if it is because of the motor spray or the shock oil - using the soft shock oil)... have to leave it aside for a day or 2 until it get back to its original size...
I just replace it with a new one anyway, so the old o-ring is in the dustbin..