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In 2008, the Lexus RX350 made a switch from using a timing belt to a timing chain. This change is welcomed by many because the timing chain is low-maintenance compared to belts. Typically, a chain can last as long as your engine does under optimal conditions. However, there is still a risk of it breaking over time. To reduce this risk, it is important to regularly change your oil and ensure you maintain the proper oil levels. A lack of oil can lead to the chain drying up and increasing the chances of it failing.
The 2008 Lexus RX 350 features a timing chain as part of its equipment.