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Hydraulic Valve Lash Adjusters, Cam Followers, Tappets...many names same part. These are the lovely parts that, over time, often loose their ability stay pumped up and produce the Subaru Tap-Tap-Tap that's so annoying to get rid of.
I've had some success with additives. But often when this starts happening the only solution is replacement. Luckily they're not that hard to replace.
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