Unlike the current Spec Miata shock, the Penske (Special emphasis, Penske who is the world leader in suspension technology) will be tamper-proof, and rebuildable through Penske at $100/shock. It is recommended that shocks be inspected by Penske after 100 hours of track use to determine whether a rebuild would be valuable. (Penske covers their a$$ very well).
With the leaky Penske shocks is the issue scratched shafts from install or Penske parts failure?
mine was a bad install (prior to the install note)