thanks for the advice Richard! I have since left the car idling and watched from underneath the car while running. The coolant is coming from somewhere at the rear of the engine/on top of of the transmission. There is no way for me to get up in there to see the source unfortunately

Any ideas on what could be causing it would be great!

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1987 560SL - 95K
1996 E300D - 183K
1997 E300D - 162K
1982 240D - 160K