The 2 above posters seem to have missed the important piece of information: Engine is a quart low after FIVE MILE DRIVE!

Since they run nearby, it's entirely possible that you've cut or damaged one of the oil cooler lines that run up under the front bumper. With a leak that big, it shouldn't be hard to find crawling under the car with a flashlight.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]