The most reliable owned is a BMW M3.
The initial model was a coupe body style. At times the M3 has also been available in saloon and convertible body styles. Due to the 4 Series coupe and convertible models no longer being part of the 3 Series range from 2015,  the F82/F83 coupe and convertible models are now called the M4. The M3 name remains in use solely for the saloon version