there are oil in the coolant reservoir. what can cause that? could it be the oil filter housing? cause there is a oil cooler attach.
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2006 Mercedes-Benz E350 4MATIC Question: what cause the oil go into the coolant system?
Answer #1badbadlee from Lee's Auto Care, February 02, 2011, 15:15Technician
WELL MANY POSS CAUSES BUT THE MAIN ONE THAT COMES TO MIND IS POSS HEAD GASKET BLOWN NOT POSITIVE ON THIS MODEL BUT COULD HAVE OIL COOLER SYST
Answer #2Holland Service Inc (6 Answers) , Burlingame, CA - (650) 343-4235Holland Service February 02, 2011, 16:20Enthusiast
could be, also could be a damaged head gasket. pressure test system and observe and repair as needed
spinbaaz October 17, 2011, 13:03Rookie
It could caused by the bad radiator. There are two compartments in the radiator, one for cooling the for antifreeze and another for transmission fluid. The the wall breaches, trans fluid and antifreeze mixes. Just like you have oil in the antifreeze tank, I am sure trans oil also has antifreeze mixed in it. It could also causes bad trans shifting.