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Oil is often a religious discussion.
I doubt anyone here can tell of an oil related failure that's happened due to a reasonable oil viscosity change within the last 59 years or so.
But
I'd follow the Ford recommendation since your knowledge base has little to do with oil types.
It comes across as reinventing the wheel due to some blurb about synthetic oil or some sale somewhere.
Take it back, get the correct oil type.
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