[Oletrucks] Valvoline Restore & Protect

[smokey]

I have been told that I should never use synthetic oil in my 235.    However, I understand that   Valvoline Restore  &  Protect works wonders for cleaning and restoring engines.    Is it safe to use in a 1957 235?
 

 
Thanks!
 

 
Smokey
 

 

 

 

 
 
 
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