Engine oil has limited life - after a certain point it starts losing lubricating qualities and carbonizes. Once it happens, the engine gets contaminated with carbon deposits or sludge (see the photo) that significantly shorten engine's life. When you change oil at or before manufacturer suggested interval, you change the oil before this "carbonizing" point, engine remains clean and once refilled with new oil ready to work hard again. If the engine oil has not been changed for long, carbon deposits start clogging the oil pick-up screen decreasing oil supply and increasing friction. Through the engine ventilation system the same carbon deposits build up inside the throttle body and EGR system causing rough idle and possible check engine light. Compression decreases and engine start wearing much faster.
If you don't remember when you changed the oil in your car last time - just check the oil on the dipstick. And every time you change the oil, the oil filter should be replaced as well.
Driving with the low oil level (less than min.) or with low oil pressure may cause serious engine damage. If you notice that the oil pressure gauge indicates low oil pressure, or if the low oil pressure warning light comes on with the engine running, have your engine inspected as soon as possible.
Always use only the appropriate engine oil type (usually you can find it on oil cap or in the owners manual).
Check your parking space for leaks. If you find any, have it repaired before it leads to more serious engine problems.
Source : Samarin
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