Changing the oil lube and oil filter helps ensure that your engine is clean and has plenty of lubrication.
The last thing you want is for your engine parts to rub against each other with no lubrication. This leads to excessive wear – which turns into expensive repairs down the road.
Oil in your vehicle needs to be renewed. As oil gets older, it becomes less good at doing its job.
The oil in your engine is generally very hot when your vehicle is running; this leads the oil to break down over time. (Some engines also burn oil, which means you’ll need to top off your oil every couple hundred miles or so.) Oil absorbs dust, water, and other gunk in your engine, holding them in suspension and keeping them from wearing your engine parts. As time goes on, your oil becomes “full” and can’t absorb these substances any longer.
A new oil filter will ensure your motor oil stays clean as it's circulated throughout the engine.
It’s also important to ensure that your oil filter is changed when you have your oil change done. A clogged or dirty filter does you no good – even if you have new, clean oil in the engine.