On a long trip what maintenance should be done?
Every time you stop for gas it is a good idea to check your car's oil level. If your oil pressure warning light goes on pull over immediately or else the engine could be destroyed. If your car begins overheating check your engine for coolant leaks or broken belts. If there aren't any such problems, switch off the air-conditioner and turn on the heater to maximum to bleed some heat from the engine. Drive to the nearest automotive service station while keeping an eye on the temperature gauge.