# Mystery Oil

**URL:** <https://community.cartalk.com/t/mystery-oil/49894>\
**Category:** Maintenance/Repairs\
**Tags:** mercedes-benz, e-class\
**Created:** [June 5, 2010, 5:31pm UTC](https://community.cartalk.com/t/mystery-oil/49894 "2010-06-05T17:31:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![evankai77](https://avatars.discourse-cdn.com/v4/letter/e/e47c2d/32.png) [@evankai77](https://community.cartalk.com/u/evankai77)\
**Post date:** [June 5, 2010, 5:31pm UTC](https://community.cartalk.com/t/mystery-oil/49894/1 "2010-06-05T17:31:32Z")

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I keep having oil apear in my water/coolant line…I replaced the head gasket earlier this year after seeing such signs at that time. Although the car runs well with the new head gasket, there is still a milk chocolate colored oil residue that appears in my water tank. I think it is clogging up my water line. Where else could this oil be coming from if it is not from a head gasket problem?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [June 5, 2010, 5:35pm UTC](https://community.cartalk.com/t/mystery-oil/49894/2 "2010-06-05T17:35:22Z")

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There a cooler line inside the radiator for the transmission fluid. If this cooler line has developed a leak transmission fluid can leak into the radiator.

Tester