Hello - Not sure if this helps but below is some information on this topic. I have read quite a few posts wherein renewal of oci has been referred to as mandatory however it does not tie up to the official source of information provider. Currently, there is relaxation on OCI renewal until 30th June 2021, hope this helps.
The official Bureau of Immigration (BOI) site mentions that as long as you carry your old passport(s) having the Lifelong 'U' visa sticker alongwith the OCI booklet, entry is allowed. Please find details here
https://boi.gov.in/content/visa-requirement
Here is the detail from the site -
Overseas Citizen Of India (OCI) :-
Passengers who are carrying old cancelled passports having Life Long Indian "U" Visa Sticker affixed on it along with new passport are allowed entry into India.
Even if the OCI card holder acquires nationality of a different country, except that of Pakistan and Bangladesh, he/she is also allowed entry into India provided he/she is carrying his/her old passport having Life Long Indian "U" Visa sticker pasted on it along with the new passport of the recently acquired nationality.
https://www.hcilondon.gov.in/page/recen ... rs-on-oci/ >>
https://www.hcilondon.gov.in/docs/16105196161.pdf which is from the High Commission of London mentions of relaxation of OCI renewal until 30th June 2021.
Appreciate if you can share any information from anyone who has recently travelled that contradicts to the above.