Oil arguments will go on until there is no more oil. I've following them for decades now, and probably the best answer I've read consistently is to use a good quality motor oil and change it often, along with the oil filter. Regarding any upper-end sounds, if you are hearing those noises after the engine has warmed-up then the upper-end is simply not receiving the proper lubrication as the oil circulation is in play. Having to use clinging additives to prevent these is a design flaw. You'd be better off simply adding a preoiler.
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