Eight to ten degrees retarded injection timing might just might effect the lowest practical cold temperature starting point quite a bit. Might not either for all I know on these particular engines. Pretty critical on some other indirect injection engines in my limited experience. Even three to four degrees makes a large difference on them. Mercedes pre chamber design may have a buffering effect that is greater than other makes even though they use simular bosh injectors as well. Overall I agree with Sam and Brian though.