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I don't think it will have any positive impact. Getting everything coated with regular engine oil is the most important. Did you check the cylinders with a boroscope? I would suggest checking all 8 cylinders looking for a ring of corrosion where the rings sat. If there is one you will have to decide whether you'll just drive the car or try to clean out the rings, which will require a complete engine breakdown.
Marvel Mystery Oil is great for protecting corrosive parts, but I doubt it will be able to release a seized ring.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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