All lifters started clicking at once
Sounds more likely to be a timing rattle rather then all the lifters at once making noise, if your EGR valve is bad this will happen and if the timing is off it will also do this, I can't buy the theory all 16 hydraulic lifters are noisey unless you over reved it something fierce, or ran it out of oil, or had someone loosen all the rockers.
Happy Motoring!!
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