I have tried stetoscope. My engine does not sounds fine - I have seen few D5 engines, not even 1 sounded similar to mine.
I am planning to do job myself, so wont be as bad. You don't have to use VOVLO lifters, there are many aftermarket ones. New fuel lines are advised, but not a must. As I said before I have tried new oil with flush, diesel and lifter additive - no change.
I will write more info here, when I finally get around and change them.
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