I think it would be a FANTASTIC name for a site offering oil change coupons!
Just put up a site and tell people how they can get the coupons.
I don't know much/anything about oil change coupons. If they have a resale value, you could offer them for sale. If they have no resale value (as I imagine they might not) then you could make money form your visits by advertising, but it would need to be pretty busy to make decent money.
You could get garages to provide you with coupons and they would pay to advertise their coupons on your site.
Good luck!