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The manufacturer recommends using SAE 0w-20 full synthetic oil for the 2018 Toyota Sienna with a 3.5 liter engine, which has an oil capacity of 5.8 quarts. It is important to change the engine oil and filter every 3000 to 5000 miles to maintain peak engine performance. Failing to do so can result in the oil losing viscosity and inadequate lubrication of internal engine parts like pistons and cylinders. Prices for oil can vary from $5 to $10 per quart, depending on whether it is conventional or synthetic and the quality/brand of the oil. When changing the oil, be sure to also replace the oil filter. Keeping up with oil changes is crucial for vehicle maintenance, and the oil light in the vehicle serves as a reminder for this key service interval.
Whether it's the eight-passenger or seven-passenger 2018 Toyota Sienna trim, all versions use the 0w-20 oil. The L, LE, Limited, Limited Premium, SE, XLE, and XLE Premium trims, which are all equipped with the 3.5-liter engine, require 5.8 quarts of oil. Even the models with an "Auto Access" upgrade still utilize the same oil type.
5.8 quarts can be expressed as approximately 5.5 liters.