Most car rental companies in Porto require a credit card for renting a car. However, there may be some smaller local rental agencies that accept alternative forms of payment such as debit cards or cash deposits. It is recommended to check with the rental company beforehand.

When renting a car in Porto, you will typically need to present the following documents:

• A valid driver's license from your home country or an International Driving Permit (IDP)
• A valid passport or identification card
• A credit card in the name of the main driver for the security deposit
• Proof of insurance coverage, either through a third-party insurer or the rental company's own coverage options

It is always best to check the specific requirements of the rental company you plan to use, as they may have additional document requirements.

Yes, it is possible to rent a car in Porto with a foreign driver's license. However, it is recommended to also carry an International Driving Permit (IDP) along with your valid foreign license, as some rental companies may require it.

Yes, most car rental companies in Porto allow you to add an additional driver to your rental agreement. However, there may be an additional fee for each additional driver, and they will typically need to meet the same age and driver's license requirements as the primary driver.

The typical fuel policy for car rentals in Porto is to return the car with the same amount of fuel as when it was picked up. Some rental companies may offer a full-to-full policy, where you are provided with a full tank and are expected to refill it before returning the car. Others may operate on a full-to-empty policy, where you are charged for a full tank of fuel upfront and can return the car with any amount of fuel remaining.

If there is damage to the rental car in Porto, you should immediately inform the car rental company and document the damage with photos or written notes. The rental company will have its own policies regarding insurance coverage and damage charges, so it is important to familiarize yourself with these policies before renting the car. Depending on the extent of the damage and the insurance coverage, you may be responsible for paying an excess or deductible.