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To properly maintain a 2003 Toyota Solara with the 2.4L 4-cylinder engine, it is recommended to use synthetic SAE 5W-30 motor oil. Due to the age of the vehicle, opting for a high mileage specific blend is advisable. If you reside in a region that does not experience freezing temperatures, you could opt for a viscosity of 10W-30 to enhance engine performance. By following these guidelines and using the recommended synthetic oil, you can extend the interval between oil changes to around 7,000 miles or a year. When changing the oil, the WIX'S57145 filter is a good choice, although any brand aftermarket filter can be used as long as it is without a bracket. It's important to tighten the oil drain plug to 18 pound feet of torque during the oil change process.
The 2003 Toyota Solara requires 5 quarts of synthetic 5w-30 engine oil for proper functioning.