I just changed the oil for the second time (after 3000 miles) after having bought my 300E with 188K miles in Sept. '03. In between, I replaced 4 quarts - clearly it's losing oil big time. I see no ugly exhaust or oil spots under the car, so I wonder where it's going, not that it matters much. 4 quarts in 3K miles is too much.

I think I'm looking at rebuilding the engine and wonder what a ballpark estimate may be for repairs? Other suggestions?

Thanks!

Sean