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Thanks for the advice. Having a spent some more time on it today trying to determine where the oil is coming from I was idling the car for about 10mins and the coolant started to boil over and did so again when I left the header tank cap off. This has got me thinking that it could be cylinder...

I have also been told by Mercedes that there are 2 types of head bolts used - the engine uses 6 of one and 4 of the other - anyone know if this is correct?

The box oil is nice and red, also level wise it's as it should be. If it was the box cooler then wouldn't there be some signs of mayo on the auto box dipstick? Or a higher oil level due to the coolant?

Managed to spend a hour or so on the engine to try to determine how much mayo is in the engine and found this: The whole cooling system is filled with the stuff so flushing it all out will be a nightmare and the possibility of the block and head being damaged from overheating is...

Sorry to drag up an old post but wondering how you got on with this job? Success? Easy to do?

Thanks for all your replies. I am thinking that it is more likely a radiator failure of some sort rather than a CHG failure due to the amount of mayo - the box has been shifting a bit harsher recently as well which is not a good sign.

Thanks for the input guys - I will be ringing around tomorrow for some info regarding whether the car has an oil cooler which is a part of the radiator and if it is then this could be the cause (clutching at straws!).

Sorry to drag up an old thread but what was the outcome of this?

Also could anyone tell me whether there is any oil cooler fitted to this engine as that could be a possible route cause to the oil on the coolant which would a much easier job than a Headgasket change.

Hello! My parents have a W124 E200 which they bought brand new back in 1995 and has 120k miles on the clock - it's never missed a beat in 19yrs until this weekend. Yesterday the car over heated in traffic and was recovered back home - I had a look and found that the header tank was full...