TravelThird-party insurance doesn’t cover ‘no-protection’ rentalsCustomers who have their own annual or single-trip car hire insurance might think that they're already covered. See our reviews of the best car hire insurance. We also found that standard UK credit cards offer zero car rental protection. The only exception we could find was with the high-end (annual fee of £650 per year) American Express Platinum card, which does offer comprehensive worldwide car rental insurance. We don’t think it’s reasonable for a Sixt car hire customer to be expected to know the ‘full vehicle value’, especially as they only select a ‘class of vehicle’ when booking, not a specific model.