Caiman

Hello. C270 cdi has weird oil leakage. Catching some oil in expansion tank. Changed oil cooler, twice flushed cooling system. Still thin layer of oil comes into tank. Every 200 300 km cleaning with a wipe. I dont understand, also mechanics too. Someone tells me, that blown head gasket, some tells, that is not blown headgasket. Also coolant overflowing the cap. Cap new. I did co2 test in cooling system, but was compromised by overflowing antifreeze. Also not blowing hot air in the cabin. Any ideas? This car pain in my head. There is no mystic in here. Anyone has the same problem? BTW, car is not overheating. 90-94 temperature. Thank you.

slammer111

Is there coolant in your oil? It's got to be coming in from somewhere if this is the case.

Are you sure it's engine oil? Early W203s have a known problem of transmission fluid and coolant mixing in the radiator.

Check to see if you have a Valeo brand (bad) radiator installed. if you do, have it replaced before it takes out your transmission.

W203 Valeo radiator problem

Good luck.

Caiman

No, its black like black engine oil after 10 k km. Transmission fluid pale pinkish colour. And its ok. And its not mixing at all. Just a thin thin layer of black oil. I put my finger and its covered with engine oil. Dunno what the heck it is.. Also overflowing coolant from expansion reservuar. I have take out the thermostat and the problem "solved", but engine oil pissed me off. No one of mechanic cant tell where the problem is. To dissasemble engine are very expensive, like 500 euros min, and car costs below 1k