Asking family or friends to assist one with an interest free loan

I am currently working and looking to buy a car. I am unable to buy it in cash. I have made many attempts for Muslim car dealers to try and purchase the car on credit without interest or going through bank finance. All of them rejected.

I have even proved that I am able to pay it off comfortably with my salary.

I have went to almost every Muslim dealership and all have rejected.

I am able to get a car on bank finance but I do not wish to because of the interest.

Is there any other way of doing it? Is there any other alternative to this?