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Bought ls460 in December 10, and engine ran very quietly, not tapping, smooth and quiet. Had Valve Spring Replacement (per recall) performed at Northside Lexus. Now when car idles it has a noticeable clatter sound that accelerates when the rpms increase. One salesman said "turn your radio up." It is very frustrating in that this is an expensive car...supposedly the best Lexus makes. Any thoughts?