After Bobby kicks the used oil pan, spilling about a teaspoon, Hank yells at him that the neighbors will think they're a bunch of drunks.
Gospel truth. It's the one where Hank's 20 year old truck starts having problems then stalls on some train tracks prompting purchase of a newer model.
The show's continuity in animation will show the viewer the difference if they watch carefully. Old truck was a mid-80's Ranger looking thing; new truck more of an F150 if not a F250/ Super Duty style.