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The 2002 Nissan Sentra has two available engine options which both require A5W-30 engine oil. The 1.8 L engine requires 2.9 quarts while the 2.5 L engine needs 4.4 quarts. It is recommended to use Genuine Nissan engine oil or an equivalent with an API certification seal. Opting for a synthetic oil is preferable, but if conventional oil is all you have, it will work. If using conventional oil, make sure to change it every 5,000 miles rather than the 7,500-mile interval for synthetic. Synthetic 5W-30 oil is now more affordable, with a 5-quart container available for as little as $20.
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The entry-level engine for the 2002 Nissan Sentra, a 1.8L inline-4, requires 2.9 quarts of 5W30 synthetic oil, while the upgraded engine, a 2.5L inline-4, needs 4.4 quarts of the same oil.