RE: Engine flushing ??
If the purpose of the flush is to remove dirt and paricles from the engine then how the dickens can it quieten tappets. If he means that the oil gets to the tappets quicker after flush has been used then perhaps he has a case. However I would think that it is extremely unlikely that there would be any noticeable difference in tappet noise except, perhaps, that they may become a little noisier. Was he offering you the flush at a cheaper price?
All the best, Peter.
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