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The Lexus IS250 requires 5w-30 oil for optimal performance. It's crucial to use high-quality oil to ensure the engine runs smoothly. Eventually, issues may arise if the oil is not changed regularly. Poor-quality oil can lead to engine failure, as evidenced by a burning smell or knocking noise. It's important to address any abnormalities promptly to prevent potential hazards like an engine explosion. Additionally, neglecting to change the oil can result in poor gas mileage. Regular oil changes every 5,000 to 10,000 miles are recommended to maintain the engine's health and prevent issues.
Lexus recommends using 5w-30 fully synthetic oil in the is250 model.