The ruling on the gifts given by gas stations in exchange for purchasing a specific quantity

Question:
The questioner says: I buy gasoline for my car from one of the stations that gives me the right to wash my car once after buying four hundred and fifty liters. Is that permissible for me?

Answer:
If you go for a purpose and have not completed the quantity so that they give you the gift, then that is not appropriate. This is not appropriate, and their practice is neither prescribed nor befitting, because they want to attract customers away from the owners of other stations, and they harm the other stations. It is not permissible for the owners of shops to harm one another. Rather, the Prophet (peace and blessings be upon him) forbade intercepting travelers and forbade intercepting goods so that all people may benefit. It is not permissible for anyone to gather customers to himself and draw them to himself while leaving his other brothers behind. This is unfair and dishonorable competition. Yes.

The presenter:
May Allah reward you,