Valvoline Restore and Protect drawbacks?

So called?
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I think this one is air-cooled.
 
Was thinking about the long-term ramifications of using Valvoline Restore and Protect. Just wondering if there are any downsides to using it. Could Valvoline Restore and Protect be harder on engine gaskets and seals than other oils? Because it chews up sludge and varnish, could it also chew on gaskets and seals?
Oh man, that’s all that’s keeping my 2005 Taurus together.
 
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