Originally Posted by jeffreylin
STS seems to take longer than the other engines to break in and once it's broken it it screams and lasts for a long time.
I'll second that. Take your time, break it in - the instructions are detailed on this. Once you do have the engine broken in it will last for a long time
As Hesky said - the heat gun is your friend (well, hair dryer for me) I always use'em when breaking in engines.