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A case of bad oil change advice! Cartalk.com answers a question about oil changes..."A friend of mine has claimed that there's no reason to change oil. He basically changes the oil filter, and adds a bit of oil if needed. Oil breaks down over time. Is motor oil better now than it's ever been? Yes. Is synthetic oil even better? It is. But eventually, the molecular structure of the oil does change. Oil is made up of long-chain hydrocarbons that, miraculously, cushion the metal parts of your engine that rub against each other thousands of times a minute. And when those chains break apart, the oil doesn't do nearly as good a job of providing that cushion. Plus, heat and oxygen combine with the oil to increase acidity and, if left long enough, it forms varnishes and sludge in the engine. And adding an occasional quart of new oil doesn't do anything to improve the old, broken-down, acidic oil that's still swimming around in there. And while the filter will trap any large particles that the oil picks up in its circulation, the filter won't do anything to prevent the oil's molecular breakdown. So if you have a car that you want to keep for a long time, you absolutely should change the oil at the recommended interval." We at Legacy Automotive believe fresh new oil keeps everything working smoothly and prevents expensive repairs down the road. Keep up with it to maintain your investment.