B&S smoking on startup

if you're having to add oil and its not making oil (gas+oil), i doubt the shutoff will fix your issue.
 
I also doubt the that shutoff valve is going to be of any help. Guys just put those inline, as a band aid, when they have a problem with the float seat and needle not shutting off the fuel to the float bowl. You’ve got an OHV engine and from your description I would be checking for a blown head gasket.
 
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