I have read in the Volvo owner manual that the lower chassis is coated with anti-rust product. I have recently observed some places where the coating is gone (see pictures attached). I don't know if the chassis material is internally treated against corrosion or if this black coating is what's protecting the chassis from the rust and hence if I need to re-apply some anti-rust coating on the parts where it is gone.
What do you think ?
Thanks for your replies.
