Jim:
Welcome to the forum. You might find this thread helpful from the search button on oil or trans fluid in coolant. Regards,

Oil in expansion tank 300E

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E