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The 2003 Toyota Sequoia requires SAE 5w-30 full synthetic oil with a capacity of 6 quarts. This oil helps to keep the engine's internal parts cool, lubricated, and prevents wear and damage from parts grinding against each other. The cost of an oil change for the Sequoia would typically range between $50 and $60 for labor and $110 to $120 for parts. It is recommended to have an oil change every 10,000 miles or 12 months. Warning signs that indicate the need for an oil change while driving include engine noise, a ticking engine, transmission shifting issues, shaking while idling, and decreased fuel economy. Visible signs that suggest the need for an oil change include smoke from the exhaust and oil leaks where the vehicle is parked.
The oil recommended for a 2003 Toyota Sequoia is synthetic motor oil with a viscosity rating of SAE 5W-30, as specified by the car's manufacturer.
I spoke with the dealership, and they suggest using regular oil for the 2003 model.