Very good. Nothing more than 'theories' and 'theoretical papers', usually involving other types and engines I don't know! Meanwhile my manuals remain unchanged. I will continue to operate to the official advice in my manual. Can you tell me when it has let the system down? Not 'suspicions' please.
The OP asked a question. It was answered with the official line. Some of you then went off on one with unsubstantiated theoretical stuff usually involving other engines/types. He wanted a simple answer!