Owning an exotic cars ain’t cheap. The sheer thought that Mayweather is spending what some people would make in 1 to 5 years on oil and fluid change is mind shattering. TMZ Sports spoke with Mayweather’s longtime car guy, Nigerian-born Obi Okeke also known as Doctor Bugatti ,who oversaw a maintenance on one of the boxer’s 2012 Bugatti Grand Sport Convertible. Doctor Bugatti said “The Bugatti is getting a major service. You know, ₦12.6m ( $35,000 ) worth of new tires, ₦9m ($25,000) worth of fluids and an oil change.” It’s not as if you can go to any place…