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For the 2015 Toyota Sienna, it is recommended to use 0W-20 Synthetic oil. If this is not available, it is acceptable to use 5W-20 oil as a substitute, but ensure to switch back to 0W-20 Synthetic during the next oil change. The vehicle requires 6.4 quarts of oil with the filter. The torque specification for the drain plug is 30 ft/lbs, and it is important to replace the drain plug gasket each time the oil is changed. The price of oil ranges from $2 to $22 per quart, totaling around $13 to $70 for a complete refill of 6.4 quarts. It is recommended to perform an oil and filter change every 7,500 to 10,000 miles due to oil degradation over time. The cost of an oil change typically ranges from $40 to $50 in labor charges.
In 2015 Toyota Sienna vehicles, the 2.7L I4 engine requires 4.6 quarts of oil, while the 3.5L V6 engine needs 6.4 quarts. The recommended oil type for both engines is Toyota's standard SAE 0W-20 synthetic engine oil.