If I were in the market to purchase a used Mustang, I would (and have twice before) look for:What do you look for the most (besides upkeep with maintenance) that would make you either want to buy, or not buy said vehicle?
I would also say to compare the oil change mileage to the mileage of the car. If it’s a super low mileage car, it could be that car wasn’t driven much and the oil was changed annually with low miles actually driven.If done like every 800 miles I'm wondering if it was tracked regularly.