Did you do turbo drain o rings and seals? I had a car (my grey 123) go from a dime sized drip when I parked it at night to emptying the sump every 100 miles during a 600 mile trip.

Got home and while waiting for the parts to fix it to arrive had the other cars (blue 123) same seal start leaking at nearly the same rate in the course of about 7 days of driving around town, less than 50 miles and it went from a drip now and then in the driveway to leaving puddles about 8 inches in diameter at traffic lights.

Thankfully I had ordered 2 sets of seals. Now neither car drips a single drop.

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1982 300D (w123, "Grey Car")
1982 300D (w123, "Blue Car")
2001 Ford F150 "Clifford" (The Big Red Truck)
1997 Dodge Ram 2500 12V Cummins
1996 Dodge Ram 2500 12V Cummins
Previous Vehicles:
1995 E300D, 1980 300SD, 1992 Buick Century, 2005 Saturn Ion