If you check the oil right after turning the car off you will get an inaccurate reading, as some of the oil will still be at the top of the engine. Keep the car on a level, even surface as well to make sure you aren't checking the oil on a slant.  Most auto manufacturers require you check the oil after the car has been warmed by starting it in place for 3-5 minutes. Check your owner's manual if there is any doubt.  To be safe, you should check your oil every month, and more frequently if you have to drive long distances. Is the oil black, brown, or clear? Is the dipstick itself clean, or mottled and dark? Oil may start out light tan, but it will always darken with use as the engine runs, collecting impurities from the combustion cycle and from getting hot. Its color is also dependent on mileage. For example, if you are driving an older car 5000 miles a month, your car might burn a quart of oil a month.  If the oil looks milky or white you could have a coolant leak and must get the car towed to a mechanic immediately. If the oil has metallic particles or bits in it, get it to a mechanic immediately.  If the oil seems dirty or sludge-like, it's time to change your oil.  You should not be filling up the oil every few weeks or month -- this could be the sign of a leak.
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