I borrowed someone’s car. When I returned it I parked by a meter. I paid the meter for the lender for an hour. Would that be a problem of ribbis?
It is not a problem regarding ribbis. Ribbis is only when you borrow something like money, which is meant to use it and repay something else. With the car you lent the car and even if you gave the owner back something extra, it would be no less than money for rent of the car, which is permitted.