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The 2003 Toyota Highlander comes equipped with a 2.4 liter inline-4 engine and uses SAE 5w-30 fully synthetic motor oil. It holds about 4.2 quarts of oil. You can easily find this oil at retail locations, automotive stores, and online car parts shops, typically priced between $3 and $13 per bottle. If you have the 3.0 liter V6 engine, the oil capacity increases to 5.2 quarts of 5w-30 oil. When changing the oil, ensure the old oil is drained from the bottom nozzle of the reservoir. Then, use a funnel to add the new oil through the top cap opening.
The standard 2.4L inline-4 motor in the 2003 Toyota Highlander requires 4 quarts of 5W30 synthetic oil, while the upgraded 3.0L V6 engine that can be chosen for this vehicle needs 5 quarts of the same 5W30 synthetic oil.
On my cell phone, my motor is so pristine that I could have a meal off of it. During my oil change, the mechanics remarked, "When did you last get an oil change?" I inquired why, and they replied, "Your oil appears to be fresh as if it's brand new.