When you pick up the car at the store, foreign car rental companies need to swipe the pre-authorization from your international credit card as a deposit, which usually includes the deductible part of oil fee, collision insurance and theft insurance (if any). In some countries, the lessee must pay a deposit for damages. Pre-authorization does not generate actual deduction, but the bank freezes the credit line you agree to authorize as a guarantee.

At that time, I booked a car rental, and the deposit was refunded 1 week after returning the car.