What I do is a weekly check up. I check the oil, radiator water, windshield washing fluid, and tire air pressure. Once a month I check the lights to make sure they all work. Police can give you a ticket for a bad light and that is expensive. The other thing I do once a month which is pretty important is check my tires for nails or screws. Seems like once a year I get something like that stuck in my tire and while it may not puncture or flatten your tire it's good to have them removed. I bought my tires at Big 0 and they fix these problems for free (you paid for services, so they aren't really free). They also rotate my tires for free as well. Be sure to take advantage of any of the services that come with your tires, they help your tires last longer.