Damn.....I Think im experiencing the same issue....

my 2010 has 88k on her though and i noticed a splatter of oil out the exhaust during start up.

took the covers off and followed the turbos and i can see discoloration from fluid at the joints so my turbo seals could be going out too

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2001 Titanium Silver Metallic Pearl / IR
900rwhp Turbo M3
-Heavily Modded

2010 *700 awhp X5M
- 22 Rohana R22s black Deep concave staggered
- cat-less down pipes
- Titanium tipped Megan Racing exhaust
- D2 Coilovers
- K&N air filters
- JP Euro / HCP Stage 2 Tune