We have made an offer to the public on the sale of fuel. It is as follows: The person pays 200 Riyals and gets a fuel coupon that is worth 210 Riyals and also gets a free car wash. It should be noted that they have to pay the 200 Riyals in advance (Part No. 13; Page No. 34) in order to get the fuel coupons. We hope that your Eminence will explain to us the legal ruling on this offer. Is it lawful? May Allah reward you with the best.
If the reality is as you have mentioned, then it is permissible
to sell fuel coupons and a free car wash with the value mentioned. The offer here is for selling an amount of petrol and a free car wash which is stated in the coupon. Therefore, it is not a Gharar sale (fraudulent transaction where details about the sold item are unknown or uncertain), or Riba (usury/interest) or Jahalah sale (sale with lack of knowledge).
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.