Vehicle Questions and Answers
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The 2007 Toyota Highlander Hybrid runs on SAE 0W-20 oil, and Toyota suggests using synthetic oil for better wear protection and longer life. With synthetic oil, you'll only need to change it every 7,500 miles, compared to 3,500 to 5,000 miles with conventional oil. It's recommended to inspect your oil monthly to ensure it's filled correctly and clean of debris. If the oil appears very dark, it's time to consider a replacement.
My 2007 Highlander AWD has clocked 245,000 miles already, and I make sure to use full synthetic high mileage 5W-20 oil for it.
I don't have any concrete answers to offer. All I can do is strongly disagree with your suggestions.
For optimal performance, the 2007 Toyota Highlander Hybrid operates most effectively with SAE 5W-20 motor oil.