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The 2015 INFINITI Q50's 3.7-liter 6-cylinder engine needs 5.2 US quarts of 5W-30 oil along with a filter. It's recommended to change the oil and filter every 7,500-10,000 miles or once a year if you use fully synthetic oil. If you use conventional oil, it's best to change the oil and filter every 3,000-5,000 miles or every 6 months. Synthetic oils provide better lubrication for engine parts, allow for longer intervals between service appointments, and work well in extreme weather conditions. Thinner viscosity oils flow better in cold weather, protecting the engine from friction and corrosion. A typical oil change with filter replacement costs around $150-$180 for materials and labor.
The recommended engine oil for the 2015 Infiniti Q50 is one quart of full synthetic SAE 5W-30 motor oil.