Back to School: What Buses, Garbage Trucks, and Squad Cars Actually Do to an Engine
September sees school buses roll again, and for most people that means the end of summer and a return to routine. This edition of The Fuel Focus looks at what these vehicles actually go through in a normal day, because it's very different from what most engine oils and drivetrain fluids are designed around. Buses, garbage trucks, police cruisers, and fire trucks spend most of their working hours doing three things: sitting still with the engine running, starting cold, and covering short distances between stops. A tractor-trailer running interstate freight holds a steady speed and temperature for hours at a stretch. None of these municipal vehicles get that. A bus route is pickup, idle, short hop, idle again. A garbage truck idles at the curb, compacts a load, moves fifty feet, and idles again. Police and fire vehicles often run the engine for lights, radios, or climate control long after the vehicle has stopped moving. That is a lot of engine hours without much heat and little sustained load, and manufacturers classify it as severe service even though nothing about it looks extreme on the surface. Why short trips impact engines more than you'd think Oil needs time at [...]


