Just another word on this or any other 6.9 for that matter. They should now be treated as "keepers" - in my opinion, given a it of luck and perseverance, 6.9's should increase in value as time goes by. They may not have the "panache"of a 6.3, but they are more user friendly, more reliable and cheaper to maintain - especially as far as the fuel system is concerned - and, believe it or not, the majority of parts are cheaper to purchase.
.......and when all said and done, they may not show a 6.3 a clean pair of heels in the accelerations stakes, but just accelerate your 6.9 in second gear from about 50 onwards - all hell can break loose. Regards. Styria