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The 2007 Lexus RX400h is equipped with a timing belt. It is recommended to change the coolant every 60,000 miles and replace the air filter every 15,000 to 30,000 miles. Spark plugs should be replaced every 100,000 miles unless they are copper, in which case they should be changed every 30,000 miles. Engine issues may arise, such as a loose gasket or a spark plug coming off, leading to problems. Oil leaks should be fixed promptly to prevent further damage. Overheating is a serious concern that could result in fires and even the vehicle exploding. Keep an eye on oil consumption and change it sooner if needed.
A 2007 Lexus RX400h comes equipped with a timing belt rather than a timing chain.