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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?

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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

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