R53, engine irattles at a stand still, but when i step on the clinch it goes away, anyone have any idea what the problem "might" be?

also, is it me or is the oil burning quickly on these things? my prevoius engine was burning oil and i since had an engine swap and the new engine is doing the same....when i say burning, i mean extreme...i don't get get to 3000 miles and i notice there's a significant drop in oil, no leaks what so ever (i'm assuming the supercharge is guzzling it?)