I'm not sure what an oil change coupon is. I presume it is something that gets a garage to change the oil in your car?
You also haven't mentioned actually speaking to garages. If you can get a few garages on board, they might be willing to put a flyer or something in their office. It might also be attractive for the cheapest garage in any given town to advertise themselves as such.
You also haven't mentioned actually speaking to garages. If you can get a few garages on board, they might be willing to put a flyer or something in their office. It might also be attractive for the cheapest garage in any given town to advertise themselves as such.
Disclaimer: I know nothing about business.