Be sure to TOW this to the repair shop. I had this happen and it blew the engine up! The engine parts are not that expensive IF you don't run it without pressure!
On my car, the timing chain ate the lower rail PINS and caused the pins to drop into the pan. The oil pump then sucked them up past the screen and POWWWW!, the engine was gone.
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS