[The_Dover]

Good day all,

I'm new on here and have a 2007 335i MSport Touring which I purchased aout 6 weeks ago with 115k KM on the clock, which I have added another 4k too since

I got a low coolant level service warning yesterday morning and when I topped it up I noticed a brown sludge in the reservoir.

This morning I have checked the reservoir after doing approximately 80km yesterday afternoon and there is an increase in the amount of sludge. I've attached a picture I took 5 minutes ago.

It feels slightly greasy but does not leave an oily residue on my fingers when washed off with household soap. It does not smell oily that I can tell.

What are the possible causes (leaking filter housing gasket? head gasket?) and how concerned should I be?

I'm going to take it to the dealer where I purchased it tomorrow and get them to have a look but I am at risk of engine damage if I continue to drive the car?

Any advise would be much appreciated.

Thanks,

Ben