Thanks DenisHaving read yet again in detail, the "BMW University' B57 engine training document posted on this forum, I am beginning to change my view on EGR and AdBlue (DEF) deletion! Coupled with this I have sought other explanations regarding the function of the Cat. converter (= SCR) and the particulate filter (DPF).
The B57 setup in the Grenadier has two devices which separate oil from the gases in the EGR system (precluding the need for catch cans). Further, the non-combustible gases in the EGR system are siphoned off and treated via the DEF /AdBlue system . I hadn't realised the 'subtleties' of this engine until I examined these in detail. The "Euro6" standard, despite my initial 'reluctant squirming" to accept, actually maintains power and torque as well as producing a much cleaner outcome which should enhance engine life. The adherence to regular oil changes using high quality low ash oils is critical also to reduce the gradual build up within the DPF of non combustible deposits....
It's given me good reason to leave well alone...
So endeth the lesson for today
Interesting reading and a sound persuasion as to why I should leave well alone also.
My reason for considering otherwise was, a friend who is a haulage contractor running Scania and Mercedes wagons says that AdBlue systems are a pain for him. Like many other contractors, the system has been bypassed to improve reliability bearing in mind many of his problems are actually down to the AdBlue system itself.