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Probably a hydraulic valve lifter in need of more oil. They always want more! Not injectors, that would never go away, besides you shouldn't hear those inside the cabin with the windows rolled up. My old MPV had the same problem for 100K miles without any harm done.
If your knock sensors go, you would hear that only when you step on the gas and under load, not at idle. Besides, a certain little red light would come on and you would have to check the codes.
Klaus
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98 V70Rawd(101Kmi), 95 854T(85K mi), 75 164E(173K mi)
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