So, Vito advised against doing anything about Sonny and Apollonia?
Not in so many words. It's always been implied and understood that Vito didn't want Michael to act while he was still alive, especially against Carlo. He couldn't live with making Connie a widow but he knew that Michael could and ultimately would.
"I got news for you. If it wasn't for the toilet, there would be no books." --- George Costanza.
