^^Thanks.
First of all you dont need it, theres no need to prep the motor for synthetic oil, secondly I would advise against it because it takes a few oil changes to get all of the motor flush out of the motor. When you drop the oil after the flush it stays in the lines ect and I wouldint want that stuff flowing through there for an extended period of time. Now changing to synthetic from dyno is a great idea because it provides better protection, as well as cleans out your motor from all of the sludge but it does it slower then the motor flush, and without the harsh chemicals. People will say that after a certain amount of miles it is not a good idea to swich to synthetic because it causes your motor to start leaking oil. What the synthetic does is clean out all of the sludge that is clinging on to the seals, which is sometimes whats stoping them from leaking. When you start running the synthetic all that sludge will start breaking off the motor and get caught by your filter. So esentially the synthetic will clean your motor and I would consider it safer then the flush as it does not contain any harsh cleaning agents like kerosene.
Heres an example of a valve cover ran with dyno and one that was ran with synthetic oil.

Dyno on top and synthetic on bottom.

Photos taken from here,
http://www.preludeonline.com/showthr...il+valve+cover