If it's an extremely slow leak, you may be able to get away with a slightly thicker oil to buy you more time. All leaks have to eventually be repaired correctly though. Front main or rear? The fronts aren't too bad, the rears are another story.

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Current Bimmer
2004 X5 4.4i Sterling Grey Sport/Premium

Past Bimmers
1991 318I Alpine White
1995 740I Alpine White
1991 525I Schwartz
1998 323IS Scwartz
2004 330CI Cabrio Titanium Silver Metallic
1995 540I Schwartz
2000 Z4 3.0 Titanium Silver
2000 330ci Coupe Titanium Silver