Musk emphasized that the key advantage to increasing productivity for Tesla is limiting the number of moving parts in an electric motor to 20m versus up to 10,000 parts for an internal combustion engine. But Breitbart News reported 18 months ago that two-thirds of Tesla's electric motor drivetrains fail, and have to be replaced before vehicles reach 60,000 miles, according to Green Car Reports. Some Tesla owners have reported multiple replacements of drivetrains. Breitbart also reported in March that Tesla was being slammed by lawsuits from employees that complaining about racial discrimination and sexual harassment. Dewitt Lambert filed suit claiming that he was continuously harassed in 2015 and 2016 by assembly-line supervisors and co-workers with a torrent of racial epithets, talk about the size of his penis, and an employee shoving a drill gun into his rear end. Lambert claims that despite the maltreatment, he was still expected to work 12-hour shifts for six days per week.