Pull the dipstick - is it milky white too?
Drain a little oil - is it milky white?

If neither are milky white, it is simply condensation around the cap. My ML did that, as well my E430.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport