Don't know about your motor, but for my M119, timing chain guide rails are all plastic, could be some broken pieces fell into the oil pan, their color is dark amber.

__________________
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.