+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
One of my friend faced same issue.
For changing OCI, apostilled documents from USA were needed like Birth Certificate, Marriage Certificate etc to get a fresh new OCI issued with US passport.
Simply put - If decide to Use CAN Passport - You have OCI associated to-date.
If want to use US Passport only - get an e-Visa associated with US Passport as Plan B and carry both passports, that way you are covered.
The whole point of having OCI is not needing to apply for e-visa.

I actually have my USA citizenship interview coming up in a little over a month, so I think I will wait for the US citizenship and then apply for OCI on US passport. It is more likely I will use US passport to travel to India.

Thanks for your inputs and for sharing the links. All very helpful.
 
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