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The only way to tell if 5w50 gives longer bearing life is to open up an engine that has 50k mileage with 5w50 and examine the bearings.
I dont think zinc or phosphor additives will extend rodbearing life as I think the rodbearingwear in the s50/54/65/85 is an oil cavitation issue and not a friction wear issue.
The round spots that show as the initial wear pattern on bearings that start to show little wear are a tell tale sign to this.
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