i have discussed this issue with my mb tech here and with what knowledge he does have for this year of vehicle he thinks that no damage can be done as the valve is to allow hydraulic pressure from power steering pump to be applied to the visous coupling in the transfer case. the gear inside the transfer case has its own fluid and is a sealed unit , so his theory is that all it will disable is the pressure activation ,and the load levellling feature of the suspension.

you opinion is the first reply to any postings i have made on this subject and i will hopefully get responses , in accordance to this subject that will be as helpful, any post will be helpfull as long as they are on this subject and informed

may i ask where you got your info ?