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Hydraulic valve lifter noise is something that many of us 16-valve owners put up with from time to time. Try not to exceed 2500 rpm when they are clacking. Synthetic oil seems to help. I used Mobil 1 10W30 with added CD-2 oil detergent to help remove deposits, changed every 5K mi and Volvo or Mann oil filters. This helped quiet down a motor that was noisy when I got it. Mobil 1 worked better for me than dino oils or Castrol Syntec. I would not call in a mechanic on this yet. 16-valve motors are somewhat temperamental sometimes but I do love the way they rev.
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