If the oil is indeed from a sloppy fill, it should burn off with a few days' worth of driving. Get it out on the highway and get it good and hot and it'll burn off faster.

If the smell remains after a few days' driving, you probably have something leaking (most likely a valve cover).

__________________
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!)