The 1987 300 OM603 motor came with the weakest design head... because of this it is unwise to run the motor AT ALL if coolant loss or temp rise is noted... and it is EXTREMELY critical to keep the ENTIRE cooling system in tip top shape.

Your head is ruined. For sure. You got a warning with the temp rise and climbing temp. That was the sign to shut down the motor and get a tow truck to take it somewhere for service... the further driving destroyed it. You now need a new headgasket, AND a new head. Plus whatever caused the coolant loss and temp rise... probably the fan clutch and bugs in the radiator...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!