Originally Posted by
vinyalwhl
So I have a question concerning third party liability insurance for rental cars in Portugal. I was having a hard time finding any information on prices for supplemental third party liability insurance. I want to use my AMEX premium car insurance with additional supplemental because AMEX does not cover this. I read on this
site that third party liability insurance is mandatory on all rentals. Can anyone confirm this? Also, if anyone has any insurance advice for renting Portugal I could use it, normally I just use taxis and public transport when I travel internationally.

Unlimited third party liability insurance is included in all rentals, by law. You do not need to purchase third party liability insurance separately. In fact, you can't purchase any supplement because unlimited coverage is already provided, so how can you possibly supplement unlimited?