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Old habits die hard. A long time ago, mechanics recommended that you change the motor oil (MO) in your car every 3,000 miles. Decades of improvements in design and function have made engines far more efficient than in the past. To that end, they need new oil less frequently.

So, when do you need to change it? In this article, we’ll approach this issue by first exploring what your motor oil actually does inside your engine. I’ll then describe some of the reasons it needs to be changed periodically. Lastly, I’ll provide a short guide for doing the job yourself instead of paying your mechanic to do it. xtracms.