Mayo/dirt seen in the coolent reservoir

[SHAZ1]

As said above, its a 325i Sport.

The colour of the coolent/water in the resevoir is brown/black it seems like oily and slightly grainy like sand grains and mayo like substance can be seen on the cap.
The water hasnt been replaced since the car was purchased ie; not serviced as of yet but will be sometime this month is this something that will be resolved with a service?

Is it normal or anything i should look at ie; should i flush the system would that help?
Or is it or can it be, a much serious issue?

Thanks

[pnd]

PROBABLY a cracked head this is common on these cars what about the oil filler cap is there mayo on that? Is it using water or blowing white smoke out of the exhaust under acceleration?

[penton08]

you could try to flush the water system and refill with coolant, but it sounds like the start of a head gasket/cracked head problem. are there any traces of water in the oil?

[SHAZ1]

will check above this evening.

[SHAZ1]

although its not using any water or blowing any smoke as described above.

[SHAZ1]

Just to update,

The inside of the head ie; as far as i can see through the oil filler hole with a flash light and the oil cap has no dirt or any mayo and actually looks pretty clean but i checked this while the car was parked for 24hrs so the oil all drained into the sump,

I also checked the dip stick and that was also very clean with the oil spot on the mark or just below and the oil colour is golden/ brown as should be i presume.

So any suggestions or further checking required?? please advice, or is next step garage for proper check up??

Thanks

[kman82]

How long have you had the car? When was the last oil change?