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If other car enthusiasts had documented this sort of issue on a wide scale, I would bite. But they have not as far as I can tell. Honda and Porsche both run thin oil in high rpm hydraulic lifter motors without issue.
I have noticed some dynos flattening out on the top end and always assumed it was misfire or timing related -- old plugs or weak coils or fuel octane that did not allow maximum timing. Maybe the OP is onto a discovery, but I'll wait for conclusive dyno testing before changing from 0W40 to 10W60.
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