If this simple part fails, you engine will bleed out all the oil and seize. I'll bet that would happen within a minute or two if at highway speed, and then...

My car? I would pull the cluster, get a new line from MB (not ebay or some other re-seller whose quality is unknowable), and install that. This is not a place to try to be penny-wise, but pound-foolish. Use the remains of the old line to pull the new line through the firewall and dash.

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC