Had this problem a couple years ago and changed head gasket. That time there was oil in coolant tank, overheated but no white smoke from exhaust.

My mechanic seems to think this time may be a cracked head

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Turboman

1993 300CE Garnet Red
Eibach Springs
18x8.5 ADR M-Sport wheels (Hyper Silver)
Metal Master brake pads
Semi-gloss black front grill insert