Go and get it as part of the deal for the warr.
I would not even take that engine apart and i am a tech as well as i worked for MB until recently.
Put it this way the mantra for that car is one man one engine .So one guy builds the whole thing by hand, if you have problems it is removed and shipped back to Germany they don't work on the major stuff.
I remember in the Summer there was a brand new 1400km 2005 S55 black on black with cardboard under it and the front air 1 foot off the ground. I asked the techs and they said it is waiting for the motor to come back ,i asked why and they said it had an internal problem and they had to send it back to Germany "Head office rules" for AMG.
I know you will love the car as i sure have driving them. But you don;t want any repair costs for it in any way.
I only wish i was still with MB so i could play around with the TT V12 65 series engines with 800 hp and torque ,now that is power.
I would also search quietly and find out how to put the car into " dyno" mode for a few minutes as the experience will really make you love the car more even if it costs you a pair of tires.
It is all out test mode.
No traction
No ABS
No vehicle stability
No ABC
No limiters
Just all out raw power with instant throttle.
There is also a air ride controller which can get the car to lower and raise as needed just like the LS.
enjoy