Change it and run it out to MB's recommended OCI unless running under adverse conditions (dust, lot of stop and go). X3 on diesel rated oil for DP vehicles (2007 and newer).

__________________
-- Chris

'95 E300, 216k miles, Silver Surfer
'05 E320 CDI, 138k miles
'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991