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The 2011 Lexus RX is equipped with a single engine choice, the 3.5L V6. It requires about 6.4 quarts of oil, and the preferred type is SAE 0W-20 synthetic motor oil. If this exact type is not in stock, you could opt for 5W-20, although this isn't suggested due to its lesser viscosity. The first number in the oil weight signifies its thickness when starting up, and the second indicates its thickness at operational temperatures. It's advisable to select the lowest recommended weight for your car, even if it costs a bit more. Doing so will maintain your engine's efficiency, potentially extending its lifespan and improving fuel economy.
The 2011 Lexus RX needs 6.4 quarts (6.1 liters) of engine oil, with the recommended choice being SAE 0W-20. If you can't find SAE 0W-20, you can temporarily use 5W-20 instead.