Just because you’re changing your oil according to schedule doesn’t mean there won’t be an occasional problem. Your motor oil is the most important fluid the car needs. Think of it like your own body going without water. When that happens, things break down. There are other fluid indicators like power steering fluid and radiator levels which you should check along with the oil. This fluid check could be done once a week and can be accomplished in the same amount of time it takes you to fill up your car with petrol, give or take a few minutes. Of course, if any of the fluids are low don’t hesitate to fill them up.