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Toyota advises changing the oil and filter in your 2018 Toyota Tundra every 3,000 to 5,000 miles if you're using conventional oil. However, if you opt for synthetic oil, you can extend the oil change interval to 7,500 miles. Synthetic oil is highly recommended for its superior performance, as it reduces friction and provides better engine protection. It's safe to switch between synthetic and conventional oils without causing harm to your engine. Synthetic blends combine the benefits of both synthetic and conventional oils, keeping your engine cleaner by preventing debris and deposits from causing damage as the oil circulates through the engine.
When using synthetic oil in a Toyota Tundra, it is recommended to have the oil changed every 10,000 miles or annually. During regular intervals between changes, check the oil level and add more as necessary. If conventional oil is being used instead, make sure to change the oil every 3,000 miles.