One-way rentals between SIXT stations in Johor Bahru and elsewhere in Malaysia are generally allowed, depending on the tariff.
All renters will need a valid driver’s license for at least 2 years, plus an ID or passport. International renters with a license using a non-Roman alphabet like Arabic will also need an international driving permit.
You need to be 21 or older to rent a car in Malaysia from SIXT.