M Stevens Posted June 26, 2019 Share Posted June 26, 2019 2009 RX 350 155k My RX occasionally makes a rattling sound for a second or two when you first start it. Once running, very quiet, and runs great. Could this be a dry Rod bearing, because it is in the morning, or something with the timing chain? Quote Link to comment Share on other sites More sharing options...
Lexus Owners Club Posted July 9, 2019 Share Posted July 9, 2019 SOunds like oil is slow to get to the top end or the hydraulic tensioner....I would replace the oil and filter and replace with quality oil of the correct grade Quote Link to comment Share on other sites More sharing options...
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