CONSIDERATIONS FOR MOBILE DEVICE USAGE IN THE SHOP Page 28 All Maintenance, All Vehicle Classes, All Management, All the Time MAY 2019 TRENDS IN HEAVY DUTY ENGINE OILS New oil technologies, used oil analysis, and proper filtration help optimize oil drain intervals. Page 10 KEYS TO CONSISTENT LIFTGATE PERFORMANCE Page 18 HOW STANDARDIZED VEHICLE COMMUNICATION PROTOCOLS IMPACT DIAGNOSTICS AND VEHICLE OPERATION Page 22