I'm a ASE cert diesel / automotive tech , with G2 Detroit diesel master certs . M2 and Freightliner cert . Meritor and bendix certified , and on and on … and on . The company I work for is constantly sending us to school as the engines and emissions keep changing . I am one of the A techs in my shop ( we only have one other A tech lol) hey at least I don't have to change tires