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The 2005 Acura RL comes with a 3.5 L V6 engine that requires 5W-20 Synthetic Motor Oil for all temperatures, but you can also use 0W-20. The vehicle's oil capacity is 4.5 quarts with a filter or 4.2 quarts without one, and you should tighten the drain plug to 29 ft/lbs of torque. Synthetic oil is artificially made with chemicals and has fewer impurities compared to conventional oil. It's vital to change the oil regularly to keep the engine clean and functioning well, typically every 7,500 to 15,000 miles. The labor cost for an oil change ranges from $40 to $50.
I just finished changing the oil on a 2005 RL with the J35 engine about 15 minutes ago. The capacity is 4.5 quarts including the filter change, and it specifies 5W-20 oil on the cap and in the owner's manual.
The Acura RL from 2005 requires SAE 0W-20 synthetic oil for its engine.