Some plastics are broken down by some liquids, while another plastic remains unaffected.
If the seal material was damaged by Jet Oil another seal material would be used.
You an buy seals made from different materials that are least affected by the liquid it comes into contact with.
Seal catalogs give ratings for various seal materials and liquids they could come into contact with.
Acetone dissolves ABS, styrene and Polycarbonate among others but does not affect polypropylene.
A thin layer of acetone on two pieces of ABS or Polycarbonate will allow the pieces to be joined together.
The acetone liquifies the plastic allowing the joint to hold together when the acetone evaporates.