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The 2009 Toyota Highlander with a V6 engine requires 6.4 US quarts of 5W-30 oil, while the 4-cylinder engines need 4.7 quarts of the same oil. It's important to consult the owner's manual to confirm the specific oil capacity based on your vehicle's trim. Regular oil changes are essential to keep your SUV running smoothly, and the manufacturer recommends servicing every 7,500 - 10,000 miles using fully synthetic oil and every 3,000 - 5,000 miles with conventional oil. Most modern vehicles benefit from using fully synthetic oil, which can improve gas mileage. Choosing an oil like 5W-30 helps to ensure proper engine lubrication, particularly in colder temperatures, and reduces friction between engine parts due to its thinner viscosity. Branded oils offer superior corrosion protection compared to aftermarket options, with lube and filter services for the Highlander typically costing around $130-$140 for parts and labor.
Typically, I usually opt for Mobil 1 Extended Performance oil, occasionally trying the dealer's oil and Castrol Edge. However, I am considering switching to Amsoil oil as some individuals claim it is the top choice for full synthetic oil.
In 2009, the Toyota Highlander offers different engine options. The version with the 2.7L inline-4 engine can use 0W-20 or 5W-20 synthetic oil. If you have the 3.3L V6 engine, you can also choose between 0W-20 and 5W-20 oils. Lastly, for the 3.5L V6 engine, you can go for 5W-20 unless you have the tow package, in which case 5W-30 is recommended.