What Razak said is half true and it applies to all petrol station.No effect as it will be refunded but if you're using DEBIT card it's obvious.but no worries as it's only an 'insurance' to station.
do not swipe your credit/debit card at the pump. the bank will charge rm200 for initial charge but will refund a few weeks later. this apply to all credit card holders. swipe your card inside