Hi mr scotty I have a 2010 peugeot 207 1.6 hdi it has turbo egr and i put a 10w40 semi synthetic oil…

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Hi mr scotty
I have a 2010 peugeot 207 1.6 hdi it has turbo egr and i put a 10w40 semi synthetic oil since 2015
Peugeot recommands 5w30 5w40 and 10w40
Do you think i should return to the 5w30 for letting my engine more cleaner efficient and durable?
Is there any danger in returning from 10w40 to 5w30?