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The Jeep manufacturer recommends changing the oil and filter for your 2018 Jeep Grand Cherokee every 3,000-5,000 miles using conventional oil. Alternatively, you can opt for synthetic oil, which is more expensive but can last between 7,500 and 10,000 miles before needing a change. It is important to consult your owner's manual and talk to your dealer to determine the best intervals for your vehicle. Synthetic oil is more effective than conventional oil and maintains its viscosity better over time. Your vehicle requires SAE 0w-20 motor oil and will need approximately 5 quarts of oil and a new filter for each oil change. If you choose to do the oil change yourself, expect to pay between $5 and $10 per quart depending on the brand and quality.
You should aim to replace it anywhere from 6,000 to 10,000 miles.