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That is a wrong impression. You can use whatever engine you wish, but if it's a production engine at least 25 (cars with that engine) must have been made by the time the car gets on track. Same for the ERS. But you can use a bespoke racing engine. In that case there are no production requirements, but it looks like you also don't get a few goodies you might get by using a production engine. It's somewhat confusingly put in the rules and certain publications in their haste to say something about the regulations got it completely wrong which doesn't help.
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