The oil cooler in the radiator tanks on Mercedes are typically for the transmission. If an oil cooler is present, it is usually a small air-cooled radiator beside the main radiator or tucked under the bumper.
If the transmission has never been serviced, the oil in it can be pretty awful. I'd put a transmission service on your "to-do" short list.
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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