Changing your car's oil regularly is the cheapest and best way to prevent engine damage. Choosing the right oil is also very important. When it comes to engine oil there is synthetic and there's conventional, mainly. Conventional oil is actual oil mixed with additives. Synthetic oil is engineered "oil" made by scientists. This synthesized oil lubricates and protects better than conventional. Using anything other than synthetic in a newer car can cause damage but that's not to say conventional oil isn't still recommended. It depends on the vehicle.
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