Any time I get a new vehicle, I change the oil and transmission fluid/gear oil right away, and check all tune up parts, cap, rotor, plugs, wires, air filter, fuel filter, and make sure the fuel and vacuum lines are in good shape, check the brake fluid and clutch fluid, if manual, make sure its clean, antifreeze is bright green, maybe flush the radiator if its dirty... pretty much just make sure all of the maintenance is good and up to date, and keep the maintenance up on it. Don't keep it sittin in the grass for too long...