When owning a car, there are many checks that you should be doing on a regular basis that unfortunately we often forget to do. Checking your brakes and tyres is something that can serious affect the driving and stopping of a car and should be high on your priority list of overall checks.
Fluid levels is another essential item to tick off, and not just your water washers. You should also check the coolant levels, oil levels and brake fluid / transmission fluid levels to ensure that your car has everything it needs to function properly.
When it comes to oil, you should have it changes at every major service as dirty oil is no good for the engine. If the oil in your car looks completely black and not slightly see through then it is most probably time for a change. If you take it to your local garage they will be able to check it for you.